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 8a35f56c 2022-07-16 thomas 
 19 8a35f56c 2022-07-16 thomas #include <arpa/inet.h>
 20 8b925c6c 2022-07-16 thomas #include <sys/queue.h>
 21 8a35f56c 2022-07-16 thomas #include <sys/socket.h>
 22 8a35f56c 2022-07-16 thomas #include <sys/types.h>
 23 0335d24d 2022-08-06 thomas #include <sys/uio.h>
 24 8a35f56c 2022-07-16 thomas 
 25 8a35f56c 2022-07-16 thomas #include <errno.h>
 26 8a35f56c 2022-07-16 thomas #include <event.h>
 27 8a35f56c 2022-07-16 thomas #include <stdlib.h>
 28 8a35f56c 2022-07-16 thomas #include <stdio.h>
 29 8a35f56c 2022-07-16 thomas #include <string.h>
 30 8a35f56c 2022-07-16 thomas #include <time.h>
 31 8a35f56c 2022-07-16 thomas #include <unistd.h>
 32 8a35f56c 2022-07-16 thomas 
 33 8a35f56c 2022-07-16 thomas #include "got_error.h"
 34 ff36aeea 2022-07-16 thomas 
 35 ff36aeea 2022-07-16 thomas #include "got_compat.h"
 36 8a35f56c 2022-07-16 thomas 
 37 8a35f56c 2022-07-16 thomas #include "proc.h"
 38 8a35f56c 2022-07-16 thomas #include "gotwebd.h"
 39 8a35f56c 2022-07-16 thomas 
 40 8a35f56c 2022-07-16 thomas size_t	 fcgi_parse_record(uint8_t *, size_t, struct request *);
 41 8a35f56c 2022-07-16 thomas void	 fcgi_parse_begin_request(uint8_t *, uint16_t, struct request *,
 42 8a35f56c 2022-07-16 thomas 	    uint16_t);
 43 8a35f56c 2022-07-16 thomas void	 fcgi_parse_params(uint8_t *, uint16_t, struct request *, uint16_t);
 44 e5539f76 2022-08-10 thomas int	 fcgi_send_response(struct request *, int, const void *, size_t);
 45 8a35f56c 2022-07-16 thomas 
 46 8a35f56c 2022-07-16 thomas void	 dump_fcgi_record_header(const char *, struct fcgi_record_header *);
 47 8a35f56c 2022-07-16 thomas void	 dump_fcgi_begin_request_body(const char *,
 48 8a35f56c 2022-07-16 thomas 	    struct fcgi_begin_request_body *);
 49 8a35f56c 2022-07-16 thomas void	 dump_fcgi_end_request_body(const char *,
 50 8a35f56c 2022-07-16 thomas 	    struct fcgi_end_request_body *);
 51 8a35f56c 2022-07-16 thomas 
 52 8a35f56c 2022-07-16 thomas extern int	 cgi_inflight;
 53 8a35f56c 2022-07-16 thomas extern volatile int client_cnt;
 54 8a35f56c 2022-07-16 thomas 
 55 8a35f56c 2022-07-16 thomas void
 56 8a35f56c 2022-07-16 thomas fcgi_request(int fd, short events, void *arg)
 57 8a35f56c 2022-07-16 thomas {
 58 8a35f56c 2022-07-16 thomas 	struct request *c = arg;
 59 8a35f56c 2022-07-16 thomas 	ssize_t n;
 60 8a35f56c 2022-07-16 thomas 	size_t parsed = 0;
 61 8a35f56c 2022-07-16 thomas 
 62 8a35f56c 2022-07-16 thomas 	n = read(fd, c->buf + c->buf_pos + c->buf_len,
 63 8a35f56c 2022-07-16 thomas 	    FCGI_RECORD_SIZE - c->buf_pos-c->buf_len);
 64 8a35f56c 2022-07-16 thomas 
 65 8a35f56c 2022-07-16 thomas 	switch (n) {
 66 8a35f56c 2022-07-16 thomas 	case -1:
 67 8a35f56c 2022-07-16 thomas 		switch (errno) {
 68 8a35f56c 2022-07-16 thomas 		case EINTR:
 69 8a35f56c 2022-07-16 thomas 		case EAGAIN:
 70 8a35f56c 2022-07-16 thomas 			return;
 71 8a35f56c 2022-07-16 thomas 		default:
 72 8a35f56c 2022-07-16 thomas 			goto fail;
 73 8a35f56c 2022-07-16 thomas 		}
 74 8a35f56c 2022-07-16 thomas 		break;
 75 8a35f56c 2022-07-16 thomas 
 76 8a35f56c 2022-07-16 thomas 	case 0:
 77 8a35f56c 2022-07-16 thomas 		log_debug("closed connection");
 78 8a35f56c 2022-07-16 thomas 		goto fail;
 79 8a35f56c 2022-07-16 thomas 	default:
 80 8a35f56c 2022-07-16 thomas 		break;
 81 8a35f56c 2022-07-16 thomas 	}
 82 8a35f56c 2022-07-16 thomas 
 83 8a35f56c 2022-07-16 thomas 	c->buf_len += n;
 84 8a35f56c 2022-07-16 thomas 
 85 8a35f56c 2022-07-16 thomas 	/*
 86 8a35f56c 2022-07-16 thomas 	 * Parse the records as they are received. Per the FastCGI
 87 8a35f56c 2022-07-16 thomas 	 * specification, the server need only receive the FastCGI
 88 8a35f56c 2022-07-16 thomas 	 * parameter records in full; it is free to begin execution
 89 8a35f56c 2022-07-16 thomas 	 * at that point, which is what happens here.
 90 8a35f56c 2022-07-16 thomas 	 */
 91 8a35f56c 2022-07-16 thomas 	do {
 92 8a35f56c 2022-07-16 thomas 		parsed = fcgi_parse_record(c->buf + c->buf_pos, c->buf_len, c);
 93 8a35f56c 2022-07-16 thomas 		if (parsed != 0) {
 94 8a35f56c 2022-07-16 thomas 			c->buf_pos += parsed;
 95 8a35f56c 2022-07-16 thomas 			c->buf_len -= parsed;
 96 8a35f56c 2022-07-16 thomas 		}
 97 8a35f56c 2022-07-16 thomas 	} while (parsed > 0 && c->buf_len > 0);
 98 8a35f56c 2022-07-16 thomas 
 99 8a35f56c 2022-07-16 thomas 	/* Make space for further reads */
100 8a35f56c 2022-07-16 thomas 	if (parsed != 0)
101 8a35f56c 2022-07-16 thomas 		if (c->buf_len > 0) {
102 8a35f56c 2022-07-16 thomas 			bcopy(c->buf + c->buf_pos, c->buf, c->buf_len);
103 8a35f56c 2022-07-16 thomas 			c->buf_pos = 0;
104 8a35f56c 2022-07-16 thomas 		}
105 8a35f56c 2022-07-16 thomas 	return;
106 8a35f56c 2022-07-16 thomas fail:
107 8a35f56c 2022-07-16 thomas 	fcgi_cleanup_request(c);
108 8a35f56c 2022-07-16 thomas }
109 8a35f56c 2022-07-16 thomas 
110 8a35f56c 2022-07-16 thomas size_t
111 8a35f56c 2022-07-16 thomas fcgi_parse_record(uint8_t *buf, size_t n, struct request *c)
112 8a35f56c 2022-07-16 thomas {
113 8a35f56c 2022-07-16 thomas 	struct fcgi_record_header *h;
114 8a35f56c 2022-07-16 thomas 
115 8a35f56c 2022-07-16 thomas 	if (n < sizeof(struct fcgi_record_header))
116 8a35f56c 2022-07-16 thomas 		 return 0;
117 8a35f56c 2022-07-16 thomas 
118 8a35f56c 2022-07-16 thomas 	h = (struct fcgi_record_header*) buf;
119 8a35f56c 2022-07-16 thomas 
120 8a35f56c 2022-07-16 thomas 	dump_fcgi_record("", h);
121 8a35f56c 2022-07-16 thomas 
122 8a35f56c 2022-07-16 thomas 	if (n < sizeof(struct fcgi_record_header) + ntohs(h->content_len)
123 8a35f56c 2022-07-16 thomas 	    + h->padding_len)
124 8a35f56c 2022-07-16 thomas 		 return 0;
125 8a35f56c 2022-07-16 thomas 
126 8a35f56c 2022-07-16 thomas 	if (h->version != 1)
127 8a35f56c 2022-07-16 thomas 		log_warn("wrong version");
128 8a35f56c 2022-07-16 thomas 
129 8a35f56c 2022-07-16 thomas 	switch (h->type) {
130 8a35f56c 2022-07-16 thomas 	case FCGI_BEGIN_REQUEST:
131 8a35f56c 2022-07-16 thomas 		fcgi_parse_begin_request(buf +
132 8a35f56c 2022-07-16 thomas 		    sizeof(struct fcgi_record_header),
133 8a35f56c 2022-07-16 thomas 		    ntohs(h->content_len), c, ntohs(h->id));
134 8a35f56c 2022-07-16 thomas 		break;
135 8a35f56c 2022-07-16 thomas 	case FCGI_PARAMS:
136 8a35f56c 2022-07-16 thomas 		fcgi_parse_params(buf + 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_STDIN:
140 8a35f56c 2022-07-16 thomas 	case FCGI_ABORT_REQUEST:
141 e5539f76 2022-08-10 thomas 		if (c->sock->client_status != CLIENT_DISCONNECT &&
142 e5539f76 2022-08-10 thomas 		    c->outbuf_len != 0) {
143 e5539f76 2022-08-10 thomas 			fcgi_send_response(c, FCGI_STDOUT, c->outbuf,
144 e5539f76 2022-08-10 thomas 			    c->outbuf_len);
145 e5539f76 2022-08-10 thomas 		}
146 e5539f76 2022-08-10 thomas 
147 8a35f56c 2022-07-16 thomas 		fcgi_create_end_record(c);
148 8a35f56c 2022-07-16 thomas 		fcgi_cleanup_request(c);
149 8a35f56c 2022-07-16 thomas 		return 0;
150 8a35f56c 2022-07-16 thomas 	default:
151 8a35f56c 2022-07-16 thomas 		log_warn("unimplemented type %d", h->type);
152 8a35f56c 2022-07-16 thomas 		break;
153 8a35f56c 2022-07-16 thomas 	}
154 8a35f56c 2022-07-16 thomas 
155 8a35f56c 2022-07-16 thomas 	return (sizeof(struct fcgi_record_header) + ntohs(h->content_len)
156 8a35f56c 2022-07-16 thomas 	    + h->padding_len);
157 8a35f56c 2022-07-16 thomas }
158 8a35f56c 2022-07-16 thomas 
159 8a35f56c 2022-07-16 thomas void
160 8a35f56c 2022-07-16 thomas fcgi_parse_begin_request(uint8_t *buf, uint16_t n,
161 8a35f56c 2022-07-16 thomas     struct request *c, uint16_t id)
162 8a35f56c 2022-07-16 thomas {
163 8a35f56c 2022-07-16 thomas 	/* XXX -- FCGI_CANT_MPX_CONN */
164 8a35f56c 2022-07-16 thomas 	if (c->request_started) {
165 8a35f56c 2022-07-16 thomas 		log_warn("unexpected FCGI_BEGIN_REQUEST, ignoring");
166 8a35f56c 2022-07-16 thomas 		return;
167 8a35f56c 2022-07-16 thomas 	}
168 8a35f56c 2022-07-16 thomas 
169 8a35f56c 2022-07-16 thomas 	if (n != sizeof(struct fcgi_begin_request_body)) {
170 8a35f56c 2022-07-16 thomas 		log_warn("wrong size %d != %lu", n,
171 8a35f56c 2022-07-16 thomas 		    sizeof(struct fcgi_begin_request_body));
172 8a35f56c 2022-07-16 thomas 		return;
173 8a35f56c 2022-07-16 thomas 	}
174 8a35f56c 2022-07-16 thomas 
175 8a35f56c 2022-07-16 thomas 	c->request_started = 1;
176 8a35f56c 2022-07-16 thomas 
177 8a35f56c 2022-07-16 thomas 	c->id = id;
178 8a35f56c 2022-07-16 thomas 	SLIST_INIT(&c->env);
179 8a35f56c 2022-07-16 thomas 	c->env_count = 0;
180 8a35f56c 2022-07-16 thomas }
181 8a35f56c 2022-07-16 thomas 
182 8a35f56c 2022-07-16 thomas void
183 8a35f56c 2022-07-16 thomas fcgi_parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
184 8a35f56c 2022-07-16 thomas {
185 8a35f56c 2022-07-16 thomas 	struct env_val *env_entry;
186 8a35f56c 2022-07-16 thomas 	uint32_t name_len, val_len;
187 8a35f56c 2022-07-16 thomas 	uint8_t *sd, *dr_buf;
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 8a35f56c 2022-07-16 thomas 		if (n > 0) {
220 8a35f56c 2022-07-16 thomas 			if (buf[0] >> 7 == 0) {
221 8a35f56c 2022-07-16 thomas 				val_len = buf[0];
222 8a35f56c 2022-07-16 thomas 				n--;
223 8a35f56c 2022-07-16 thomas 				buf++;
224 8a35f56c 2022-07-16 thomas 			} else {
225 8a35f56c 2022-07-16 thomas 				if (n > 3) {
226 8a35f56c 2022-07-16 thomas 					val_len = ((buf[0] & 0x7f) << 24) +
227 8a35f56c 2022-07-16 thomas 					    (buf[1] << 16) + (buf[2] << 8) +
228 8a35f56c 2022-07-16 thomas 					     buf[3];
229 8a35f56c 2022-07-16 thomas 					n -= 4;
230 8a35f56c 2022-07-16 thomas 					buf += 4;
231 8a35f56c 2022-07-16 thomas 				} else
232 8a35f56c 2022-07-16 thomas 					return;
233 8a35f56c 2022-07-16 thomas 			}
234 8a35f56c 2022-07-16 thomas 		} else
235 8a35f56c 2022-07-16 thomas 			return;
236 8a35f56c 2022-07-16 thomas 
237 8a35f56c 2022-07-16 thomas 		if (n < name_len + val_len)
238 8a35f56c 2022-07-16 thomas 			return;
239 8a35f56c 2022-07-16 thomas 
240 8a35f56c 2022-07-16 thomas 		if ((env_entry = malloc(sizeof(struct env_val))) == NULL) {
241 8a35f56c 2022-07-16 thomas 			log_warn("cannot malloc env_entry");
242 8a35f56c 2022-07-16 thomas 			return;
243 8a35f56c 2022-07-16 thomas 		}
244 8a35f56c 2022-07-16 thomas 
245 8a35f56c 2022-07-16 thomas 		if ((env_entry->val = calloc(sizeof(char), name_len + val_len +
246 8a35f56c 2022-07-16 thomas 		    2)) == NULL) {
247 8a35f56c 2022-07-16 thomas 			log_warn("cannot allocate env_entry->val");
248 8a35f56c 2022-07-16 thomas 			free(env_entry);
249 8a35f56c 2022-07-16 thomas 			return;
250 8a35f56c 2022-07-16 thomas 		}
251 8a35f56c 2022-07-16 thomas 
252 8a35f56c 2022-07-16 thomas 		bcopy(buf, env_entry->val, name_len);
253 8a35f56c 2022-07-16 thomas 		buf += name_len;
254 8a35f56c 2022-07-16 thomas 		n -= name_len;
255 8a35f56c 2022-07-16 thomas 
256 8a35f56c 2022-07-16 thomas 		env_entry->val[name_len] = '\0';
257 8a35f56c 2022-07-16 thomas 		if (val_len < MAX_QUERYSTRING && strcmp(env_entry->val,
258 8a35f56c 2022-07-16 thomas 		    "QUERY_STRING") == 0 && c->querystring[0] == '\0') {
259 8a35f56c 2022-07-16 thomas 			bcopy(buf, c->querystring, val_len);
260 8a35f56c 2022-07-16 thomas 			c->querystring[val_len] = '\0';
261 8a35f56c 2022-07-16 thomas 		}
262 8a35f56c 2022-07-16 thomas 		if (val_len < GOTWEBD_MAXTEXT && strcmp(env_entry->val,
263 8a35f56c 2022-07-16 thomas 		    "HTTP_HOST") == 0 && c->http_host[0] == '\0') {
264 8a35f56c 2022-07-16 thomas 
265 8a35f56c 2022-07-16 thomas 			/*
266 8a35f56c 2022-07-16 thomas 			 * lazily get subdomain
267 8a35f56c 2022-07-16 thomas 			 * will only get domain if no subdomain exists
268 8a35f56c 2022-07-16 thomas 			 * this can still work if gotweb server name is the same
269 8a35f56c 2022-07-16 thomas 			 */
270 8a35f56c 2022-07-16 thomas 			sd = strchr(buf, '.');
271 8a35f56c 2022-07-16 thomas 			if (sd)
272 8a35f56c 2022-07-16 thomas 				*sd = '\0';
273 8a35f56c 2022-07-16 thomas 
274 8a35f56c 2022-07-16 thomas 			bcopy(buf, c->http_host, val_len);
275 8a35f56c 2022-07-16 thomas 			c->http_host[val_len] = '\0';
276 8a35f56c 2022-07-16 thomas 		}
277 8a35f56c 2022-07-16 thomas 		if (val_len < MAX_DOCUMENT_ROOT && strcmp(env_entry->val,
278 8a35f56c 2022-07-16 thomas 		    "DOCUMENT_ROOT") == 0 && c->document_root[0] == '\0') {
279 8a35f56c 2022-07-16 thomas 
280 8a35f56c 2022-07-16 thomas 			/* drop first char, as it's always / */
281 8a35f56c 2022-07-16 thomas 			dr_buf = &buf[1];
282 8a35f56c 2022-07-16 thomas 
283 8a35f56c 2022-07-16 thomas 			bcopy(dr_buf, c->document_root, val_len - 1);
284 8a35f56c 2022-07-16 thomas 			c->document_root[val_len] = '\0';
285 8a35f56c 2022-07-16 thomas 		}
286 8a35f56c 2022-07-16 thomas 		if (val_len < MAX_SERVER_NAME && strcmp(env_entry->val,
287 8a35f56c 2022-07-16 thomas 		    "SERVER_NAME") == 0 && c->server_name[0] == '\0') {
288 8a35f56c 2022-07-16 thomas 			/* drop first char, as it's always / */
289 8a35f56c 2022-07-16 thomas 
290 8a35f56c 2022-07-16 thomas 			bcopy(buf, c->server_name, val_len);
291 8a35f56c 2022-07-16 thomas 			c->server_name[val_len] = '\0';
292 8a35f56c 2022-07-16 thomas 		}
293 8a35f56c 2022-07-16 thomas 		env_entry->val[name_len] = '=';
294 8a35f56c 2022-07-16 thomas 
295 8a35f56c 2022-07-16 thomas 		bcopy(buf, (env_entry->val) + name_len + 1, val_len);
296 8a35f56c 2022-07-16 thomas 		buf += val_len;
297 8a35f56c 2022-07-16 thomas 		n -= val_len;
298 8a35f56c 2022-07-16 thomas 
299 8a35f56c 2022-07-16 thomas 		SLIST_INSERT_HEAD(&c->env, env_entry, entry);
300 8a35f56c 2022-07-16 thomas 		log_debug("env[%d], %s", c->env_count, env_entry->val);
301 8a35f56c 2022-07-16 thomas 		c->env_count++;
302 8a35f56c 2022-07-16 thomas 	}
303 8a35f56c 2022-07-16 thomas }
304 8a35f56c 2022-07-16 thomas 
305 8a35f56c 2022-07-16 thomas void
306 8a35f56c 2022-07-16 thomas fcgi_timeout(int fd, short events, void *arg)
307 8a35f56c 2022-07-16 thomas {
308 8a35f56c 2022-07-16 thomas 	fcgi_cleanup_request((struct request*) arg);
309 8a35f56c 2022-07-16 thomas }
310 8a35f56c 2022-07-16 thomas 
311 8a35f56c 2022-07-16 thomas int
312 8a35f56c 2022-07-16 thomas fcgi_gen_binary_response(struct request *c, const uint8_t *data, int len)
313 8a35f56c 2022-07-16 thomas {
314 e5539f76 2022-08-10 thomas 	int r;
315 e5539f76 2022-08-10 thomas 
316 8a35f56c 2022-07-16 thomas 	if (c->sock->client_status == CLIENT_DISCONNECT)
317 8a35f56c 2022-07-16 thomas 		return -1;
318 8a35f56c 2022-07-16 thomas 
319 0c2c6365 2022-07-28 thomas 	if (data == NULL || len == 0)
320 8a35f56c 2022-07-16 thomas 		return 0;
321 8a35f56c 2022-07-16 thomas 
322 e5539f76 2022-08-10 thomas 	/*
323 e5539f76 2022-08-10 thomas 	 * special case: send big replies -like blobs- directly
324 e5539f76 2022-08-10 thomas 	 * without copying.
325 e5539f76 2022-08-10 thomas 	 */
326 e5539f76 2022-08-10 thomas 	if (len > sizeof(c->outbuf)) {
327 e5539f76 2022-08-10 thomas 		if (c->outbuf_len > 0) {
328 e5539f76 2022-08-10 thomas 			fcgi_send_response(c, FCGI_STDOUT,
329 e5539f76 2022-08-10 thomas 			    c->outbuf, c->outbuf_len);
330 e5539f76 2022-08-10 thomas 			c->outbuf_len = 0;
331 e5539f76 2022-08-10 thomas 		}
332 e5539f76 2022-08-10 thomas 		return fcgi_send_response(c, FCGI_STDOUT, data, len);
333 e5539f76 2022-08-10 thomas 	}
334 e5539f76 2022-08-10 thomas 
335 e5539f76 2022-08-10 thomas 	if (len < sizeof(c->outbuf) - c->outbuf_len) {
336 e5539f76 2022-08-10 thomas 		memcpy(c->outbuf + c->outbuf_len, data, len);
337 e5539f76 2022-08-10 thomas 		c->outbuf_len += len;
338 e5539f76 2022-08-10 thomas 		return 0;
339 e5539f76 2022-08-10 thomas 	}
340 e5539f76 2022-08-10 thomas 
341 e5539f76 2022-08-10 thomas 	r = fcgi_send_response(c, FCGI_STDOUT, c->outbuf, c->outbuf_len);
342 e5539f76 2022-08-10 thomas 	if (r == -1)
343 e5539f76 2022-08-10 thomas 		return -1;
344 e5539f76 2022-08-10 thomas 
345 e5539f76 2022-08-10 thomas 	memcpy(c->outbuf, data, len);
346 e5539f76 2022-08-10 thomas 	c->outbuf_len = len;
347 8a35f56c 2022-07-16 thomas 	return 0;
348 8a35f56c 2022-07-16 thomas }
349 8a35f56c 2022-07-16 thomas 
350 8a35f56c 2022-07-16 thomas int
351 8a35f56c 2022-07-16 thomas fcgi_gen_response(struct request *c, const char *data)
352 8a35f56c 2022-07-16 thomas {
353 0c2c6365 2022-07-28 thomas 	if (data == NULL || *data == '\0')
354 8a35f56c 2022-07-16 thomas 		return 0;
355 0c2c6365 2022-07-28 thomas 	return fcgi_gen_binary_response(c, data, strlen(data));
356 8a35f56c 2022-07-16 thomas }
357 8a35f56c 2022-07-16 thomas 
358 e5539f76 2022-08-10 thomas static int
359 0335d24d 2022-08-06 thomas send_response(struct request *c, int type, const uint8_t *data,
360 0335d24d 2022-08-06 thomas     size_t len)
361 8a35f56c 2022-07-16 thomas {
362 0335d24d 2022-08-06 thomas 	static const uint8_t padding[FCGI_PADDING_SIZE];
363 0335d24d 2022-08-06 thomas 	struct fcgi_record_header header;
364 0335d24d 2022-08-06 thomas 	struct iovec iov[3];
365 8a35f56c 2022-07-16 thomas 	struct timespec ts;
366 a5a99557 2022-07-29 thomas 	ssize_t nw;
367 0335d24d 2022-08-06 thomas 	size_t padded_len, tot;
368 0335d24d 2022-08-06 thomas 	int i, err = 0, th = 2000;
369 8a35f56c 2022-07-16 thomas 
370 8a35f56c 2022-07-16 thomas 	ts.tv_sec = 0;
371 8a35f56c 2022-07-16 thomas 	ts.tv_nsec = 50;
372 8a35f56c 2022-07-16 thomas 
373 0335d24d 2022-08-06 thomas 	memset(&header, 0, sizeof(header));
374 0335d24d 2022-08-06 thomas 	header.version = 1;
375 0335d24d 2022-08-06 thomas 	header.type = type;
376 0335d24d 2022-08-06 thomas 	header.id = htons(c->id);
377 0335d24d 2022-08-06 thomas 	header.content_len = htons(len);
378 8a35f56c 2022-07-16 thomas 
379 8a35f56c 2022-07-16 thomas 	/* The FastCGI spec suggests to align the output buffer */
380 0335d24d 2022-08-06 thomas 	tot = sizeof(header) + len;
381 0335d24d 2022-08-06 thomas 	padded_len = FCGI_ALIGN(tot);
382 0335d24d 2022-08-06 thomas 	if (padded_len > tot) {
383 0335d24d 2022-08-06 thomas 		header.padding_len = padded_len - tot;
384 0335d24d 2022-08-06 thomas 		tot += header.padding_len;
385 8a35f56c 2022-07-16 thomas 	}
386 8a35f56c 2022-07-16 thomas 
387 0335d24d 2022-08-06 thomas 	iov[0].iov_base = &header;
388 0335d24d 2022-08-06 thomas 	iov[0].iov_len = sizeof(header);
389 8a35f56c 2022-07-16 thomas 
390 0335d24d 2022-08-06 thomas 	iov[1].iov_base = (void *)data;
391 0335d24d 2022-08-06 thomas 	iov[1].iov_len = len;
392 0335d24d 2022-08-06 thomas 
393 0335d24d 2022-08-06 thomas 	iov[2].iov_base = (void *)padding;
394 0335d24d 2022-08-06 thomas 	iov[2].iov_len = header.padding_len;
395 0335d24d 2022-08-06 thomas 
396 0335d24d 2022-08-06 thomas 	dump_fcgi_record("resp ", &header);
397 0335d24d 2022-08-06 thomas 
398 8a35f56c 2022-07-16 thomas 	/*
399 8a35f56c 2022-07-16 thomas 	 * XXX: add some simple write heuristics here
400 8a35f56c 2022-07-16 thomas 	 * On slower VMs, spotty connections, etc., we don't want to go right to
401 8a35f56c 2022-07-16 thomas 	 * disconnect. Let's at least try to write the data a few times before
402 8a35f56c 2022-07-16 thomas 	 * giving up.
403 8a35f56c 2022-07-16 thomas 	 */
404 0335d24d 2022-08-06 thomas 	while (tot > 0) {
405 0335d24d 2022-08-06 thomas 		nw = writev(c->fd, iov, nitems(iov));
406 a5a99557 2022-07-29 thomas 		if (nw == 0) {
407 a5a99557 2022-07-29 thomas 			c->sock->client_status = CLIENT_DISCONNECT;
408 a5a99557 2022-07-29 thomas 			break;
409 a5a99557 2022-07-29 thomas 		}
410 a5a99557 2022-07-29 thomas 		if (nw == -1) {
411 a5a99557 2022-07-29 thomas 			err++;
412 a5a99557 2022-07-29 thomas 			if (errno == EAGAIN && err < th) {
413 a5a99557 2022-07-29 thomas 				nanosleep(&ts, NULL);
414 a5a99557 2022-07-29 thomas 				continue;
415 a5a99557 2022-07-29 thomas 			}
416 460244b7 2022-07-29 thomas 			log_warn("%s: write failure", __func__);
417 8a35f56c 2022-07-16 thomas 			c->sock->client_status = CLIENT_DISCONNECT;
418 e5539f76 2022-08-10 thomas 			return -1;
419 8a35f56c 2022-07-16 thomas 		}
420 a5a99557 2022-07-29 thomas 
421 0335d24d 2022-08-06 thomas 		if (nw != tot)
422 0335d24d 2022-08-06 thomas 			log_debug("%s: partial write: %zu vs %zu", __func__,
423 0335d24d 2022-08-06 thomas 			    nw, tot);
424 0335d24d 2022-08-06 thomas 
425 0335d24d 2022-08-06 thomas 		tot -= nw;
426 0335d24d 2022-08-06 thomas 		for (i = 0; i < nitems(iov); ++i) {
427 0335d24d 2022-08-06 thomas 			if (nw < iov[i].iov_len) {
428 0335d24d 2022-08-06 thomas 				iov[i].iov_base += nw;
429 0335d24d 2022-08-06 thomas 				iov[i].iov_len -= nw;
430 0335d24d 2022-08-06 thomas 				break;
431 0335d24d 2022-08-06 thomas 			}
432 0335d24d 2022-08-06 thomas 			nw -= iov[i].iov_len;
433 0335d24d 2022-08-06 thomas 			iov[i].iov_len = 0;
434 0335d24d 2022-08-06 thomas 		}
435 8a35f56c 2022-07-16 thomas 	}
436 e5539f76 2022-08-10 thomas 
437 e5539f76 2022-08-10 thomas 	return 0;
438 0335d24d 2022-08-06 thomas }
439 8a35f56c 2022-07-16 thomas 
440 e5539f76 2022-08-10 thomas int
441 0335d24d 2022-08-06 thomas fcgi_send_response(struct request *c, int type, const void *data,
442 0335d24d 2022-08-06 thomas     size_t len)
443 0335d24d 2022-08-06 thomas {
444 e5539f76 2022-08-10 thomas 	if (c->sock->client_status == CLIENT_DISCONNECT)
445 e5539f76 2022-08-10 thomas 		return -1;
446 e5539f76 2022-08-10 thomas 
447 0335d24d 2022-08-06 thomas 	while (len > FCGI_CONTENT_SIZE) {
448 e5539f76 2022-08-10 thomas 		if (send_response(c, type, data, len) == -1)
449 e5539f76 2022-08-10 thomas 			return -1;
450 0335d24d 2022-08-06 thomas 
451 0335d24d 2022-08-06 thomas 		data += FCGI_CONTENT_SIZE;
452 0335d24d 2022-08-06 thomas 		len -= FCGI_CONTENT_SIZE;
453 0335d24d 2022-08-06 thomas 	}
454 0335d24d 2022-08-06 thomas 
455 0335d24d 2022-08-06 thomas 	if (len == 0)
456 e5539f76 2022-08-10 thomas 		return 0;
457 0335d24d 2022-08-06 thomas 
458 e5539f76 2022-08-10 thomas 	return send_response(c, type, data, len);
459 8a35f56c 2022-07-16 thomas }
460 8a35f56c 2022-07-16 thomas 
461 8a35f56c 2022-07-16 thomas void
462 8a35f56c 2022-07-16 thomas fcgi_create_end_record(struct request *c)
463 8a35f56c 2022-07-16 thomas {
464 0335d24d 2022-08-06 thomas 	struct fcgi_end_request_body end_request;
465 8a35f56c 2022-07-16 thomas 
466 0335d24d 2022-08-06 thomas 	memset(&end_request, 0, sizeof(end_request));
467 0335d24d 2022-08-06 thomas 	end_request.app_status = htonl(0); /* script status */
468 0335d24d 2022-08-06 thomas 	end_request.protocol_status = FCGI_REQUEST_COMPLETE;
469 0335d24d 2022-08-06 thomas 
470 0335d24d 2022-08-06 thomas 	fcgi_send_response(c, FCGI_END_REQUEST, &end_request,
471 0335d24d 2022-08-06 thomas 	    sizeof(end_request));
472 8a35f56c 2022-07-16 thomas }
473 8a35f56c 2022-07-16 thomas 
474 8a35f56c 2022-07-16 thomas void
475 8a35f56c 2022-07-16 thomas fcgi_cleanup_request(struct request *c)
476 8a35f56c 2022-07-16 thomas {
477 8a35f56c 2022-07-16 thomas 	cgi_inflight--;
478 8a35f56c 2022-07-16 thomas 	client_cnt--;
479 8a35f56c 2022-07-16 thomas 
480 8a35f56c 2022-07-16 thomas 	evtimer_del(&c->tmo);
481 8a35f56c 2022-07-16 thomas 	if (event_initialized(&c->ev))
482 8a35f56c 2022-07-16 thomas 		event_del(&c->ev);
483 8a35f56c 2022-07-16 thomas 
484 8a35f56c 2022-07-16 thomas 	close(c->fd);
485 8a35f56c 2022-07-16 thomas 	gotweb_free_transport(c->t);
486 8a35f56c 2022-07-16 thomas 	free(c);
487 8a35f56c 2022-07-16 thomas }
488 8a35f56c 2022-07-16 thomas 
489 8a35f56c 2022-07-16 thomas void
490 8a35f56c 2022-07-16 thomas dump_fcgi_record(const char *p, struct fcgi_record_header *h)
491 8a35f56c 2022-07-16 thomas {
492 8a35f56c 2022-07-16 thomas 	dump_fcgi_record_header(p, h);
493 8a35f56c 2022-07-16 thomas 
494 8a35f56c 2022-07-16 thomas 	if (h->type == FCGI_BEGIN_REQUEST)
495 8a35f56c 2022-07-16 thomas 		dump_fcgi_begin_request_body(p,
496 8a35f56c 2022-07-16 thomas 		    (struct fcgi_begin_request_body *)(h + 1));
497 8a35f56c 2022-07-16 thomas 	else if (h->type == FCGI_END_REQUEST)
498 8a35f56c 2022-07-16 thomas 		dump_fcgi_end_request_body(p,
499 8a35f56c 2022-07-16 thomas 		    (struct fcgi_end_request_body *)(h + 1));
500 8a35f56c 2022-07-16 thomas }
501 8a35f56c 2022-07-16 thomas 
502 8a35f56c 2022-07-16 thomas void
503 8a35f56c 2022-07-16 thomas dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
504 8a35f56c 2022-07-16 thomas {
505 8a35f56c 2022-07-16 thomas 	log_debug("%sversion:         %d", p, h->version);
506 8a35f56c 2022-07-16 thomas 	log_debug("%stype:            %d", p, h->type);
507 8a35f56c 2022-07-16 thomas 	log_debug("%srequestId:       %d", p, ntohs(h->id));
508 8a35f56c 2022-07-16 thomas 	log_debug("%scontentLength:   %d", p, ntohs(h->content_len));
509 8a35f56c 2022-07-16 thomas 	log_debug("%spaddingLength:   %d", p, h->padding_len);
510 8a35f56c 2022-07-16 thomas 	log_debug("%sreserved:        %d", p, h->reserved);
511 8a35f56c 2022-07-16 thomas }
512 8a35f56c 2022-07-16 thomas 
513 8a35f56c 2022-07-16 thomas void
514 8a35f56c 2022-07-16 thomas dump_fcgi_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
515 8a35f56c 2022-07-16 thomas {
516 8a35f56c 2022-07-16 thomas 	log_debug("%srole             %d", p, ntohs(b->role));
517 8a35f56c 2022-07-16 thomas 	log_debug("%sflags            %d", p, b->flags);
518 8a35f56c 2022-07-16 thomas }
519 8a35f56c 2022-07-16 thomas 
520 8a35f56c 2022-07-16 thomas void
521 8a35f56c 2022-07-16 thomas dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
522 8a35f56c 2022-07-16 thomas {
523 8a35f56c 2022-07-16 thomas 	log_debug("%sappStatus:       %d", p, ntohl(b->app_status));
524 8a35f56c 2022-07-16 thomas 	log_debug("%sprotocolStatus:  %d", p, b->protocol_status);
525 8a35f56c 2022-07-16 thomas }