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 8a35f56c 2022-07-16 thomas #include <sys/socket.h>
 21 8a35f56c 2022-07-16 thomas #include <sys/types.h>
 22 8a35f56c 2022-07-16 thomas 
 23 8a35f56c 2022-07-16 thomas #include <errno.h>
 24 8a35f56c 2022-07-16 thomas #include <event.h>
 25 8a35f56c 2022-07-16 thomas #include <stdlib.h>
 26 8a35f56c 2022-07-16 thomas #include <stdio.h>
 27 8a35f56c 2022-07-16 thomas #include <string.h>
 28 8a35f56c 2022-07-16 thomas #include <time.h>
 29 8a35f56c 2022-07-16 thomas #include <unistd.h>
 30 8a35f56c 2022-07-16 thomas 
 31 8a35f56c 2022-07-16 thomas #include "got_error.h"
 32 ff36aeea 2022-07-16 thomas 
 33 ff36aeea 2022-07-16 thomas #include "got_compat.h"
 34 8a35f56c 2022-07-16 thomas 
 35 8a35f56c 2022-07-16 thomas #include "proc.h"
 36 8a35f56c 2022-07-16 thomas #include "gotwebd.h"
 37 8a35f56c 2022-07-16 thomas 
 38 8a35f56c 2022-07-16 thomas size_t	 fcgi_parse_record(uint8_t *, size_t, struct request *);
 39 8a35f56c 2022-07-16 thomas void	 fcgi_parse_begin_request(uint8_t *, uint16_t, struct request *,
 40 8a35f56c 2022-07-16 thomas 	    uint16_t);
 41 8a35f56c 2022-07-16 thomas void	 fcgi_parse_params(uint8_t *, uint16_t, struct request *, uint16_t);
 42 8a35f56c 2022-07-16 thomas void	 fcgi_send_response(struct request *, struct fcgi_response *);
 43 8a35f56c 2022-07-16 thomas 
 44 8a35f56c 2022-07-16 thomas void	 dump_fcgi_record_header(const char *, struct fcgi_record_header *);
 45 8a35f56c 2022-07-16 thomas void	 dump_fcgi_begin_request_body(const char *,
 46 8a35f56c 2022-07-16 thomas 	    struct fcgi_begin_request_body *);
 47 8a35f56c 2022-07-16 thomas void	 dump_fcgi_end_request_body(const char *,
 48 8a35f56c 2022-07-16 thomas 	    struct fcgi_end_request_body *);
 49 8a35f56c 2022-07-16 thomas 
 50 8a35f56c 2022-07-16 thomas extern int	 cgi_inflight;
 51 8a35f56c 2022-07-16 thomas extern volatile int client_cnt;
 52 8a35f56c 2022-07-16 thomas 
 53 8a35f56c 2022-07-16 thomas void
 54 8a35f56c 2022-07-16 thomas fcgi_request(int fd, short events, void *arg)
 55 8a35f56c 2022-07-16 thomas {
 56 8a35f56c 2022-07-16 thomas 	struct request *c = arg;
 57 8a35f56c 2022-07-16 thomas 	ssize_t n;
 58 8a35f56c 2022-07-16 thomas 	size_t parsed = 0;
 59 8a35f56c 2022-07-16 thomas 
 60 8a35f56c 2022-07-16 thomas 	n = read(fd, c->buf + c->buf_pos + c->buf_len,
 61 8a35f56c 2022-07-16 thomas 	    FCGI_RECORD_SIZE - c->buf_pos-c->buf_len);
 62 8a35f56c 2022-07-16 thomas 
 63 8a35f56c 2022-07-16 thomas 	switch (n) {
 64 8a35f56c 2022-07-16 thomas 	case -1:
 65 8a35f56c 2022-07-16 thomas 		switch (errno) {
 66 8a35f56c 2022-07-16 thomas 		case EINTR:
 67 8a35f56c 2022-07-16 thomas 		case EAGAIN:
 68 8a35f56c 2022-07-16 thomas 			return;
 69 8a35f56c 2022-07-16 thomas 		default:
 70 8a35f56c 2022-07-16 thomas 			goto fail;
 71 8a35f56c 2022-07-16 thomas 		}
 72 8a35f56c 2022-07-16 thomas 		break;
 73 8a35f56c 2022-07-16 thomas 
 74 8a35f56c 2022-07-16 thomas 	case 0:
 75 8a35f56c 2022-07-16 thomas 		log_debug("closed connection");
 76 8a35f56c 2022-07-16 thomas 		goto fail;
 77 8a35f56c 2022-07-16 thomas 	default:
 78 8a35f56c 2022-07-16 thomas 		break;
 79 8a35f56c 2022-07-16 thomas 	}
 80 8a35f56c 2022-07-16 thomas 
 81 8a35f56c 2022-07-16 thomas 	c->buf_len += n;
 82 8a35f56c 2022-07-16 thomas 
 83 8a35f56c 2022-07-16 thomas 	/*
 84 8a35f56c 2022-07-16 thomas 	 * Parse the records as they are received. Per the FastCGI
 85 8a35f56c 2022-07-16 thomas 	 * specification, the server need only receive the FastCGI
 86 8a35f56c 2022-07-16 thomas 	 * parameter records in full; it is free to begin execution
 87 8a35f56c 2022-07-16 thomas 	 * at that point, which is what happens here.
 88 8a35f56c 2022-07-16 thomas 	 */
 89 8a35f56c 2022-07-16 thomas 	do {
 90 8a35f56c 2022-07-16 thomas 		parsed = fcgi_parse_record(c->buf + c->buf_pos, c->buf_len, c);
 91 8a35f56c 2022-07-16 thomas 		if (parsed != 0) {
 92 8a35f56c 2022-07-16 thomas 			c->buf_pos += parsed;
 93 8a35f56c 2022-07-16 thomas 			c->buf_len -= parsed;
 94 8a35f56c 2022-07-16 thomas 		}
 95 8a35f56c 2022-07-16 thomas 	} while (parsed > 0 && c->buf_len > 0);
 96 8a35f56c 2022-07-16 thomas 
 97 8a35f56c 2022-07-16 thomas 	/* Make space for further reads */
 98 8a35f56c 2022-07-16 thomas 	if (parsed != 0)
 99 8a35f56c 2022-07-16 thomas 		if (c->buf_len > 0) {
100 8a35f56c 2022-07-16 thomas 			bcopy(c->buf + c->buf_pos, c->buf, c->buf_len);
101 8a35f56c 2022-07-16 thomas 			c->buf_pos = 0;
102 8a35f56c 2022-07-16 thomas 		}
103 8a35f56c 2022-07-16 thomas 	return;
104 8a35f56c 2022-07-16 thomas fail:
105 8a35f56c 2022-07-16 thomas 	fcgi_cleanup_request(c);
106 8a35f56c 2022-07-16 thomas }
107 8a35f56c 2022-07-16 thomas 
108 8a35f56c 2022-07-16 thomas size_t
109 8a35f56c 2022-07-16 thomas fcgi_parse_record(uint8_t *buf, size_t n, struct request *c)
110 8a35f56c 2022-07-16 thomas {
111 8a35f56c 2022-07-16 thomas 	struct fcgi_record_header *h;
112 8a35f56c 2022-07-16 thomas 
113 8a35f56c 2022-07-16 thomas 	if (n < sizeof(struct fcgi_record_header))
114 8a35f56c 2022-07-16 thomas 		 return 0;
115 8a35f56c 2022-07-16 thomas 
116 8a35f56c 2022-07-16 thomas 	h = (struct fcgi_record_header*) buf;
117 8a35f56c 2022-07-16 thomas 
118 8a35f56c 2022-07-16 thomas 	dump_fcgi_record("", h);
119 8a35f56c 2022-07-16 thomas 
120 8a35f56c 2022-07-16 thomas 	if (n < sizeof(struct fcgi_record_header) + ntohs(h->content_len)
121 8a35f56c 2022-07-16 thomas 	    + h->padding_len)
122 8a35f56c 2022-07-16 thomas 		 return 0;
123 8a35f56c 2022-07-16 thomas 
124 8a35f56c 2022-07-16 thomas 	if (h->version != 1)
125 8a35f56c 2022-07-16 thomas 		log_warn("wrong version");
126 8a35f56c 2022-07-16 thomas 
127 8a35f56c 2022-07-16 thomas 	switch (h->type) {
128 8a35f56c 2022-07-16 thomas 	case FCGI_BEGIN_REQUEST:
129 8a35f56c 2022-07-16 thomas 		fcgi_parse_begin_request(buf +
130 8a35f56c 2022-07-16 thomas 		    sizeof(struct fcgi_record_header),
131 8a35f56c 2022-07-16 thomas 		    ntohs(h->content_len), c, ntohs(h->id));
132 8a35f56c 2022-07-16 thomas 		break;
133 8a35f56c 2022-07-16 thomas 	case FCGI_PARAMS:
134 8a35f56c 2022-07-16 thomas 		fcgi_parse_params(buf + sizeof(struct fcgi_record_header),
135 8a35f56c 2022-07-16 thomas 		    ntohs(h->content_len), c, ntohs(h->id));
136 8a35f56c 2022-07-16 thomas 		break;
137 8a35f56c 2022-07-16 thomas 	case FCGI_STDIN:
138 8a35f56c 2022-07-16 thomas 	case FCGI_ABORT_REQUEST:
139 8a35f56c 2022-07-16 thomas 		fcgi_create_end_record(c);
140 8a35f56c 2022-07-16 thomas 		fcgi_cleanup_request(c);
141 8a35f56c 2022-07-16 thomas 		return 0;
142 8a35f56c 2022-07-16 thomas 	default:
143 8a35f56c 2022-07-16 thomas 		log_warn("unimplemented type %d", h->type);
144 8a35f56c 2022-07-16 thomas 		break;
145 8a35f56c 2022-07-16 thomas 	}
146 8a35f56c 2022-07-16 thomas 
147 8a35f56c 2022-07-16 thomas 	return (sizeof(struct fcgi_record_header) + ntohs(h->content_len)
148 8a35f56c 2022-07-16 thomas 	    + h->padding_len);
149 8a35f56c 2022-07-16 thomas }
150 8a35f56c 2022-07-16 thomas 
151 8a35f56c 2022-07-16 thomas void
152 8a35f56c 2022-07-16 thomas fcgi_parse_begin_request(uint8_t *buf, uint16_t n,
153 8a35f56c 2022-07-16 thomas     struct request *c, uint16_t id)
154 8a35f56c 2022-07-16 thomas {
155 8a35f56c 2022-07-16 thomas 	/* XXX -- FCGI_CANT_MPX_CONN */
156 8a35f56c 2022-07-16 thomas 	if (c->request_started) {
157 8a35f56c 2022-07-16 thomas 		log_warn("unexpected FCGI_BEGIN_REQUEST, ignoring");
158 8a35f56c 2022-07-16 thomas 		return;
159 8a35f56c 2022-07-16 thomas 	}
160 8a35f56c 2022-07-16 thomas 
161 8a35f56c 2022-07-16 thomas 	if (n != sizeof(struct fcgi_begin_request_body)) {
162 8a35f56c 2022-07-16 thomas 		log_warn("wrong size %d != %lu", n,
163 8a35f56c 2022-07-16 thomas 		    sizeof(struct fcgi_begin_request_body));
164 8a35f56c 2022-07-16 thomas 		return;
165 8a35f56c 2022-07-16 thomas 	}
166 8a35f56c 2022-07-16 thomas 
167 8a35f56c 2022-07-16 thomas 	c->request_started = 1;
168 8a35f56c 2022-07-16 thomas 
169 8a35f56c 2022-07-16 thomas 	c->id = id;
170 8a35f56c 2022-07-16 thomas 	SLIST_INIT(&c->env);
171 8a35f56c 2022-07-16 thomas 	c->env_count = 0;
172 8a35f56c 2022-07-16 thomas }
173 8a35f56c 2022-07-16 thomas 
174 8a35f56c 2022-07-16 thomas void
175 8a35f56c 2022-07-16 thomas fcgi_parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
176 8a35f56c 2022-07-16 thomas {
177 8a35f56c 2022-07-16 thomas 	struct env_val *env_entry;
178 8a35f56c 2022-07-16 thomas 	uint32_t name_len, val_len;
179 8a35f56c 2022-07-16 thomas 	uint8_t *sd, *dr_buf;
180 8a35f56c 2022-07-16 thomas 
181 8a35f56c 2022-07-16 thomas 	if (!c->request_started) {
182 8a35f56c 2022-07-16 thomas 		log_warn("FCGI_PARAMS without FCGI_BEGIN_REQUEST, ignoring");
183 8a35f56c 2022-07-16 thomas 		return;
184 8a35f56c 2022-07-16 thomas 	}
185 8a35f56c 2022-07-16 thomas 
186 8a35f56c 2022-07-16 thomas 	if (c->id != id) {
187 8a35f56c 2022-07-16 thomas 		log_warn("unexpected id, ignoring");
188 8a35f56c 2022-07-16 thomas 		return;
189 8a35f56c 2022-07-16 thomas 	}
190 8a35f56c 2022-07-16 thomas 
191 8a35f56c 2022-07-16 thomas 	if (n == 0) {
192 8a35f56c 2022-07-16 thomas 		gotweb_process_request(c);
193 8a35f56c 2022-07-16 thomas 		return;
194 8a35f56c 2022-07-16 thomas 	}
195 8a35f56c 2022-07-16 thomas 
196 8a35f56c 2022-07-16 thomas 	while (n > 0) {
197 8a35f56c 2022-07-16 thomas 		if (buf[0] >> 7 == 0) {
198 8a35f56c 2022-07-16 thomas 			name_len = buf[0];
199 8a35f56c 2022-07-16 thomas 			n--;
200 8a35f56c 2022-07-16 thomas 			buf++;
201 8a35f56c 2022-07-16 thomas 		} else {
202 8a35f56c 2022-07-16 thomas 			if (n > 3) {
203 8a35f56c 2022-07-16 thomas 				name_len = ((buf[0] & 0x7f) << 24) +
204 8a35f56c 2022-07-16 thomas 				    (buf[1] << 16) + (buf[2] << 8) + buf[3];
205 8a35f56c 2022-07-16 thomas 				n -= 4;
206 8a35f56c 2022-07-16 thomas 				buf += 4;
207 8a35f56c 2022-07-16 thomas 			} else
208 8a35f56c 2022-07-16 thomas 				return;
209 8a35f56c 2022-07-16 thomas 		}
210 8a35f56c 2022-07-16 thomas 
211 8a35f56c 2022-07-16 thomas 		if (n > 0) {
212 8a35f56c 2022-07-16 thomas 			if (buf[0] >> 7 == 0) {
213 8a35f56c 2022-07-16 thomas 				val_len = buf[0];
214 8a35f56c 2022-07-16 thomas 				n--;
215 8a35f56c 2022-07-16 thomas 				buf++;
216 8a35f56c 2022-07-16 thomas 			} else {
217 8a35f56c 2022-07-16 thomas 				if (n > 3) {
218 8a35f56c 2022-07-16 thomas 					val_len = ((buf[0] & 0x7f) << 24) +
219 8a35f56c 2022-07-16 thomas 					    (buf[1] << 16) + (buf[2] << 8) +
220 8a35f56c 2022-07-16 thomas 					     buf[3];
221 8a35f56c 2022-07-16 thomas 					n -= 4;
222 8a35f56c 2022-07-16 thomas 					buf += 4;
223 8a35f56c 2022-07-16 thomas 				} else
224 8a35f56c 2022-07-16 thomas 					return;
225 8a35f56c 2022-07-16 thomas 			}
226 8a35f56c 2022-07-16 thomas 		} else
227 8a35f56c 2022-07-16 thomas 			return;
228 8a35f56c 2022-07-16 thomas 
229 8a35f56c 2022-07-16 thomas 		if (n < name_len + val_len)
230 8a35f56c 2022-07-16 thomas 			return;
231 8a35f56c 2022-07-16 thomas 
232 8a35f56c 2022-07-16 thomas 		if ((env_entry = malloc(sizeof(struct env_val))) == NULL) {
233 8a35f56c 2022-07-16 thomas 			log_warn("cannot malloc env_entry");
234 8a35f56c 2022-07-16 thomas 			return;
235 8a35f56c 2022-07-16 thomas 		}
236 8a35f56c 2022-07-16 thomas 
237 8a35f56c 2022-07-16 thomas 		if ((env_entry->val = calloc(sizeof(char), name_len + val_len +
238 8a35f56c 2022-07-16 thomas 		    2)) == NULL) {
239 8a35f56c 2022-07-16 thomas 			log_warn("cannot allocate env_entry->val");
240 8a35f56c 2022-07-16 thomas 			free(env_entry);
241 8a35f56c 2022-07-16 thomas 			return;
242 8a35f56c 2022-07-16 thomas 		}
243 8a35f56c 2022-07-16 thomas 
244 8a35f56c 2022-07-16 thomas 		bcopy(buf, env_entry->val, name_len);
245 8a35f56c 2022-07-16 thomas 		buf += name_len;
246 8a35f56c 2022-07-16 thomas 		n -= name_len;
247 8a35f56c 2022-07-16 thomas 
248 8a35f56c 2022-07-16 thomas 		env_entry->val[name_len] = '\0';
249 8a35f56c 2022-07-16 thomas 		if (val_len < MAX_QUERYSTRING && strcmp(env_entry->val,
250 8a35f56c 2022-07-16 thomas 		    "QUERY_STRING") == 0 && c->querystring[0] == '\0') {
251 8a35f56c 2022-07-16 thomas 			bcopy(buf, c->querystring, val_len);
252 8a35f56c 2022-07-16 thomas 			c->querystring[val_len] = '\0';
253 8a35f56c 2022-07-16 thomas 		}
254 8a35f56c 2022-07-16 thomas 		if (val_len < GOTWEBD_MAXTEXT && strcmp(env_entry->val,
255 8a35f56c 2022-07-16 thomas 		    "HTTP_HOST") == 0 && c->http_host[0] == '\0') {
256 8a35f56c 2022-07-16 thomas 
257 8a35f56c 2022-07-16 thomas 			/*
258 8a35f56c 2022-07-16 thomas 			 * lazily get subdomain
259 8a35f56c 2022-07-16 thomas 			 * will only get domain if no subdomain exists
260 8a35f56c 2022-07-16 thomas 			 * this can still work if gotweb server name is the same
261 8a35f56c 2022-07-16 thomas 			 */
262 8a35f56c 2022-07-16 thomas 			sd = strchr(buf, '.');
263 8a35f56c 2022-07-16 thomas 			if (sd)
264 8a35f56c 2022-07-16 thomas 				*sd = '\0';
265 8a35f56c 2022-07-16 thomas 
266 8a35f56c 2022-07-16 thomas 			bcopy(buf, c->http_host, val_len);
267 8a35f56c 2022-07-16 thomas 			c->http_host[val_len] = '\0';
268 8a35f56c 2022-07-16 thomas 		}
269 8a35f56c 2022-07-16 thomas 		if (val_len < MAX_DOCUMENT_ROOT && strcmp(env_entry->val,
270 8a35f56c 2022-07-16 thomas 		    "DOCUMENT_ROOT") == 0 && c->document_root[0] == '\0') {
271 8a35f56c 2022-07-16 thomas 
272 8a35f56c 2022-07-16 thomas 			/* drop first char, as it's always / */
273 8a35f56c 2022-07-16 thomas 			dr_buf = &buf[1];
274 8a35f56c 2022-07-16 thomas 
275 8a35f56c 2022-07-16 thomas 			bcopy(dr_buf, c->document_root, val_len - 1);
276 8a35f56c 2022-07-16 thomas 			c->document_root[val_len] = '\0';
277 8a35f56c 2022-07-16 thomas 		}
278 8a35f56c 2022-07-16 thomas 		if (val_len < MAX_SERVER_NAME && strcmp(env_entry->val,
279 8a35f56c 2022-07-16 thomas 		    "SERVER_NAME") == 0 && c->server_name[0] == '\0') {
280 8a35f56c 2022-07-16 thomas 			/* drop first char, as it's always / */
281 8a35f56c 2022-07-16 thomas 
282 8a35f56c 2022-07-16 thomas 			bcopy(buf, c->server_name, val_len);
283 8a35f56c 2022-07-16 thomas 			c->server_name[val_len] = '\0';
284 8a35f56c 2022-07-16 thomas 		}
285 8a35f56c 2022-07-16 thomas 		env_entry->val[name_len] = '=';
286 8a35f56c 2022-07-16 thomas 
287 8a35f56c 2022-07-16 thomas 		bcopy(buf, (env_entry->val) + name_len + 1, val_len);
288 8a35f56c 2022-07-16 thomas 		buf += val_len;
289 8a35f56c 2022-07-16 thomas 		n -= val_len;
290 8a35f56c 2022-07-16 thomas 
291 8a35f56c 2022-07-16 thomas 		SLIST_INSERT_HEAD(&c->env, env_entry, entry);
292 8a35f56c 2022-07-16 thomas 		log_debug("env[%d], %s", c->env_count, env_entry->val);
293 8a35f56c 2022-07-16 thomas 		c->env_count++;
294 8a35f56c 2022-07-16 thomas 	}
295 8a35f56c 2022-07-16 thomas }
296 8a35f56c 2022-07-16 thomas 
297 8a35f56c 2022-07-16 thomas void
298 8a35f56c 2022-07-16 thomas fcgi_timeout(int fd, short events, void *arg)
299 8a35f56c 2022-07-16 thomas {
300 8a35f56c 2022-07-16 thomas 	fcgi_cleanup_request((struct request*) arg);
301 8a35f56c 2022-07-16 thomas }
302 8a35f56c 2022-07-16 thomas 
303 8a35f56c 2022-07-16 thomas int
304 8a35f56c 2022-07-16 thomas fcgi_gen_binary_response(struct request *c, const uint8_t *data, int len)
305 8a35f56c 2022-07-16 thomas {
306 8a35f56c 2022-07-16 thomas 	struct fcgi_response *resp;
307 8a35f56c 2022-07-16 thomas 	struct fcgi_record_header *header;
308 8a35f56c 2022-07-16 thomas 	ssize_t n = 0;
309 8a35f56c 2022-07-16 thomas 	int i;
310 8a35f56c 2022-07-16 thomas 
311 8a35f56c 2022-07-16 thomas 	if (c->sock->client_status == CLIENT_DISCONNECT)
312 8a35f56c 2022-07-16 thomas 		return -1;
313 8a35f56c 2022-07-16 thomas 
314 8a35f56c 2022-07-16 thomas 	if (data == NULL)
315 8a35f56c 2022-07-16 thomas 		return 0;
316 8a35f56c 2022-07-16 thomas 
317 8a35f56c 2022-07-16 thomas 	if ((resp = calloc(1, sizeof(struct fcgi_response))) == NULL) {
318 8a35f56c 2022-07-16 thomas 		log_warn("%s: cannot calloc fcgi_response", __func__);
319 8a35f56c 2022-07-16 thomas 		return -1;
320 8a35f56c 2022-07-16 thomas 	}
321 8a35f56c 2022-07-16 thomas 
322 8a35f56c 2022-07-16 thomas 	header = (struct fcgi_record_header*) resp->data;
323 8a35f56c 2022-07-16 thomas 	header->version = 1;
324 8a35f56c 2022-07-16 thomas 	header->type = FCGI_STDOUT;
325 8a35f56c 2022-07-16 thomas 	header->id = htons(c->id);
326 8a35f56c 2022-07-16 thomas 	header->padding_len = 0;
327 8a35f56c 2022-07-16 thomas 	header->reserved = 0;
328 8a35f56c 2022-07-16 thomas 
329 8a35f56c 2022-07-16 thomas 	for (i = 0; i < len; i++) {
330 8a35f56c 2022-07-16 thomas 		resp->data[i+8] = data[i];
331 8a35f56c 2022-07-16 thomas 		n++;
332 8a35f56c 2022-07-16 thomas 	}
333 8a35f56c 2022-07-16 thomas 
334 8a35f56c 2022-07-16 thomas 	header->content_len = htons(n);
335 8a35f56c 2022-07-16 thomas 	resp->data_pos = 0;
336 8a35f56c 2022-07-16 thomas 	resp->data_len = n + sizeof(struct fcgi_record_header);
337 8a35f56c 2022-07-16 thomas 	fcgi_send_response(c, resp);
338 8a35f56c 2022-07-16 thomas 
339 8a35f56c 2022-07-16 thomas 	return 0;
340 8a35f56c 2022-07-16 thomas }
341 8a35f56c 2022-07-16 thomas 
342 8a35f56c 2022-07-16 thomas int
343 8a35f56c 2022-07-16 thomas fcgi_gen_response(struct request *c, const char *data)
344 8a35f56c 2022-07-16 thomas {
345 8a35f56c 2022-07-16 thomas 	struct fcgi_response *resp;
346 8a35f56c 2022-07-16 thomas 	struct fcgi_record_header *header;
347 8a35f56c 2022-07-16 thomas 	ssize_t n = 0;
348 8a35f56c 2022-07-16 thomas 	int i;
349 8a35f56c 2022-07-16 thomas 
350 8a35f56c 2022-07-16 thomas 	if (c->sock->client_status == CLIENT_DISCONNECT)
351 8a35f56c 2022-07-16 thomas 		return -1;
352 8a35f56c 2022-07-16 thomas 
353 8a35f56c 2022-07-16 thomas 	if (data == NULL)
354 8a35f56c 2022-07-16 thomas 		return 0;
355 8a35f56c 2022-07-16 thomas 
356 8a35f56c 2022-07-16 thomas 	if (strlen(data) == 0)
357 8a35f56c 2022-07-16 thomas 		return 0;
358 8a35f56c 2022-07-16 thomas 
359 8a35f56c 2022-07-16 thomas 	if ((resp = calloc(1, sizeof(struct fcgi_response))) == NULL) {
360 8a35f56c 2022-07-16 thomas 		log_warn("%s: cannot calloc fcgi_response", __func__);
361 8a35f56c 2022-07-16 thomas 		return -1;
362 8a35f56c 2022-07-16 thomas 	}
363 8a35f56c 2022-07-16 thomas 
364 8a35f56c 2022-07-16 thomas 	header = (struct fcgi_record_header*) resp->data;
365 8a35f56c 2022-07-16 thomas 	header->version = 1;
366 8a35f56c 2022-07-16 thomas 	header->type = FCGI_STDOUT;
367 8a35f56c 2022-07-16 thomas 	header->id = htons(c->id);
368 8a35f56c 2022-07-16 thomas 	header->padding_len = 0;
369 8a35f56c 2022-07-16 thomas 	header->reserved = 0;
370 8a35f56c 2022-07-16 thomas 
371 8a35f56c 2022-07-16 thomas 	for (i = 0; i < strlen(data); i++) {
372 8a35f56c 2022-07-16 thomas 		resp->data[i+8] = data[i];
373 8a35f56c 2022-07-16 thomas 		n++;
374 8a35f56c 2022-07-16 thomas 	}
375 8a35f56c 2022-07-16 thomas 
376 8a35f56c 2022-07-16 thomas 	header->content_len = htons(n);
377 8a35f56c 2022-07-16 thomas 	resp->data_pos = 0;
378 8a35f56c 2022-07-16 thomas 	resp->data_len = n + sizeof(struct fcgi_record_header);
379 8a35f56c 2022-07-16 thomas 	fcgi_send_response(c, resp);
380 8a35f56c 2022-07-16 thomas 
381 8a35f56c 2022-07-16 thomas 	return 0;
382 8a35f56c 2022-07-16 thomas }
383 8a35f56c 2022-07-16 thomas 
384 8a35f56c 2022-07-16 thomas void
385 8a35f56c 2022-07-16 thomas fcgi_send_response(struct request *c, struct fcgi_response *resp)
386 8a35f56c 2022-07-16 thomas {
387 8a35f56c 2022-07-16 thomas 	struct fcgi_record_header *header;
388 8a35f56c 2022-07-16 thomas 	struct timespec ts;
389 8a35f56c 2022-07-16 thomas 	size_t padded_len;
390 8a35f56c 2022-07-16 thomas 	int err = 0, th = 2000;
391 8a35f56c 2022-07-16 thomas 
392 8a35f56c 2022-07-16 thomas 	ts.tv_sec = 0;
393 8a35f56c 2022-07-16 thomas 	ts.tv_nsec = 50;
394 8a35f56c 2022-07-16 thomas 
395 8a35f56c 2022-07-16 thomas 	header = (struct fcgi_record_header*)resp->data;
396 8a35f56c 2022-07-16 thomas 
397 8a35f56c 2022-07-16 thomas 	/* The FastCGI spec suggests to align the output buffer */
398 8a35f56c 2022-07-16 thomas 	padded_len = FCGI_ALIGN(resp->data_len);
399 8a35f56c 2022-07-16 thomas 	if (padded_len > resp->data_len) {
400 8a35f56c 2022-07-16 thomas 		/* There should always be FCGI_PADDING_SIZE bytes left */
401 8a35f56c 2022-07-16 thomas 		if (padded_len > FCGI_RECORD_SIZE)
402 8a35f56c 2022-07-16 thomas 			log_warn("response too long");
403 8a35f56c 2022-07-16 thomas 		header->padding_len = padded_len - resp->data_len;
404 8a35f56c 2022-07-16 thomas 		resp->data_len = padded_len;
405 8a35f56c 2022-07-16 thomas 	}
406 8a35f56c 2022-07-16 thomas 
407 8a35f56c 2022-07-16 thomas 	dump_fcgi_record("resp ", header);
408 8a35f56c 2022-07-16 thomas 
409 8a35f56c 2022-07-16 thomas 	/*
410 8a35f56c 2022-07-16 thomas 	 * XXX: add some simple write heuristics here
411 8a35f56c 2022-07-16 thomas 	 * On slower VMs, spotty connections, etc., we don't want to go right to
412 8a35f56c 2022-07-16 thomas 	 * disconnect. Let's at least try to write the data a few times before
413 8a35f56c 2022-07-16 thomas 	 * giving up.
414 8a35f56c 2022-07-16 thomas 	 */
415 8a35f56c 2022-07-16 thomas 	while ((write(c->fd, resp->data + resp->data_pos,
416 8a35f56c 2022-07-16 thomas 	    resp->data_len)) == -1) {
417 8a35f56c 2022-07-16 thomas 		nanosleep(&ts, NULL);
418 8a35f56c 2022-07-16 thomas 		err++;
419 8a35f56c 2022-07-16 thomas 		if (err == th) {
420 8a35f56c 2022-07-16 thomas 			c->sock->client_status = CLIENT_DISCONNECT;
421 8a35f56c 2022-07-16 thomas 			break;
422 8a35f56c 2022-07-16 thomas 		}
423 8a35f56c 2022-07-16 thomas 	}
424 8a35f56c 2022-07-16 thomas 
425 8a35f56c 2022-07-16 thomas 	free(resp);
426 8a35f56c 2022-07-16 thomas }
427 8a35f56c 2022-07-16 thomas 
428 8a35f56c 2022-07-16 thomas void
429 8a35f56c 2022-07-16 thomas fcgi_create_end_record(struct request *c)
430 8a35f56c 2022-07-16 thomas {
431 8a35f56c 2022-07-16 thomas 	struct fcgi_response *resp;
432 8a35f56c 2022-07-16 thomas 	struct fcgi_record_header *header;
433 8a35f56c 2022-07-16 thomas 	struct fcgi_end_request_body *end_request;
434 8a35f56c 2022-07-16 thomas 
435 8a35f56c 2022-07-16 thomas 	if ((resp = calloc(1, sizeof(struct fcgi_response))) == NULL) {
436 8a35f56c 2022-07-16 thomas 		log_warn("cannot calloc fcgi_response");
437 8a35f56c 2022-07-16 thomas 		return;
438 8a35f56c 2022-07-16 thomas 	}
439 8a35f56c 2022-07-16 thomas 	header = (struct fcgi_record_header*) resp->data;
440 8a35f56c 2022-07-16 thomas 	header->version = 1;
441 8a35f56c 2022-07-16 thomas 	header->type = FCGI_END_REQUEST;
442 8a35f56c 2022-07-16 thomas 	header->id = htons(c->id);
443 8a35f56c 2022-07-16 thomas 	header->content_len = htons(sizeof(struct
444 8a35f56c 2022-07-16 thomas 	    fcgi_end_request_body));
445 8a35f56c 2022-07-16 thomas 	header->padding_len = 0;
446 8a35f56c 2022-07-16 thomas 	header->reserved = 0;
447 8a35f56c 2022-07-16 thomas 	end_request = (struct fcgi_end_request_body *) (resp->data +
448 8a35f56c 2022-07-16 thomas 	    sizeof(struct fcgi_record_header));
449 8a35f56c 2022-07-16 thomas 	end_request->app_status = htonl(0); /* script_status */
450 8a35f56c 2022-07-16 thomas 	end_request->protocol_status = FCGI_REQUEST_COMPLETE;
451 8a35f56c 2022-07-16 thomas 	end_request->reserved[0] = 0;
452 8a35f56c 2022-07-16 thomas 	end_request->reserved[1] = 0;
453 8a35f56c 2022-07-16 thomas 	end_request->reserved[2] = 0;
454 8a35f56c 2022-07-16 thomas 	resp->data_pos = 0;
455 8a35f56c 2022-07-16 thomas 	resp->data_len = sizeof(struct fcgi_end_request_body) +
456 8a35f56c 2022-07-16 thomas 	    sizeof(struct fcgi_record_header);
457 8a35f56c 2022-07-16 thomas 	fcgi_send_response(c, resp);
458 8a35f56c 2022-07-16 thomas }
459 8a35f56c 2022-07-16 thomas 
460 8a35f56c 2022-07-16 thomas void
461 8a35f56c 2022-07-16 thomas fcgi_cleanup_request(struct request *c)
462 8a35f56c 2022-07-16 thomas {
463 8a35f56c 2022-07-16 thomas 	cgi_inflight--;
464 8a35f56c 2022-07-16 thomas 	client_cnt--;
465 8a35f56c 2022-07-16 thomas 
466 8a35f56c 2022-07-16 thomas 	evtimer_del(&c->tmo);
467 8a35f56c 2022-07-16 thomas 	if (event_initialized(&c->ev))
468 8a35f56c 2022-07-16 thomas 		event_del(&c->ev);
469 8a35f56c 2022-07-16 thomas 
470 8a35f56c 2022-07-16 thomas 	close(c->fd);
471 8a35f56c 2022-07-16 thomas 	gotweb_free_transport(c->t);
472 8a35f56c 2022-07-16 thomas 	free(c);
473 8a35f56c 2022-07-16 thomas }
474 8a35f56c 2022-07-16 thomas 
475 8a35f56c 2022-07-16 thomas void
476 8a35f56c 2022-07-16 thomas dump_fcgi_record(const char *p, struct fcgi_record_header *h)
477 8a35f56c 2022-07-16 thomas {
478 8a35f56c 2022-07-16 thomas 	dump_fcgi_record_header(p, h);
479 8a35f56c 2022-07-16 thomas 
480 8a35f56c 2022-07-16 thomas 	if (h->type == FCGI_BEGIN_REQUEST)
481 8a35f56c 2022-07-16 thomas 		dump_fcgi_begin_request_body(p,
482 8a35f56c 2022-07-16 thomas 		    (struct fcgi_begin_request_body *)(h + 1));
483 8a35f56c 2022-07-16 thomas 	else if (h->type == FCGI_END_REQUEST)
484 8a35f56c 2022-07-16 thomas 		dump_fcgi_end_request_body(p,
485 8a35f56c 2022-07-16 thomas 		    (struct fcgi_end_request_body *)(h + 1));
486 8a35f56c 2022-07-16 thomas }
487 8a35f56c 2022-07-16 thomas 
488 8a35f56c 2022-07-16 thomas void
489 8a35f56c 2022-07-16 thomas dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
490 8a35f56c 2022-07-16 thomas {
491 8a35f56c 2022-07-16 thomas 	log_debug("%sversion:         %d", p, h->version);
492 8a35f56c 2022-07-16 thomas 	log_debug("%stype:            %d", p, h->type);
493 8a35f56c 2022-07-16 thomas 	log_debug("%srequestId:       %d", p, ntohs(h->id));
494 8a35f56c 2022-07-16 thomas 	log_debug("%scontentLength:   %d", p, ntohs(h->content_len));
495 8a35f56c 2022-07-16 thomas 	log_debug("%spaddingLength:   %d", p, h->padding_len);
496 8a35f56c 2022-07-16 thomas 	log_debug("%sreserved:        %d", p, h->reserved);
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_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
501 8a35f56c 2022-07-16 thomas {
502 8a35f56c 2022-07-16 thomas 	log_debug("%srole             %d", p, ntohs(b->role));
503 8a35f56c 2022-07-16 thomas 	log_debug("%sflags            %d", p, b->flags);
504 8a35f56c 2022-07-16 thomas }
505 8a35f56c 2022-07-16 thomas 
506 8a35f56c 2022-07-16 thomas void
507 8a35f56c 2022-07-16 thomas dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
508 8a35f56c 2022-07-16 thomas {
509 8a35f56c 2022-07-16 thomas 	log_debug("%sappStatus:       %d", p, ntohl(b->app_status));
510 8a35f56c 2022-07-16 thomas 	log_debug("%sprotocolStatus:  %d", p, b->protocol_status);
511 8a35f56c 2022-07-16 thomas }