1 3e4749f7 2020-10-02 op /*
  2 3e4749f7 2020-10-02 op  * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
  3 3e4749f7 2020-10-02 op  *
  4 3e4749f7 2020-10-02 op  * Permission to use, copy, modify, and distribute this software for any
  5 3e4749f7 2020-10-02 op  * purpose with or without fee is hereby granted, provided that the above
  6 3e4749f7 2020-10-02 op  * copyright notice and this permission notice appear in all copies.
  7 3e4749f7 2020-10-02 op  *
  8 3e4749f7 2020-10-02 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 3e4749f7 2020-10-02 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 3e4749f7 2020-10-02 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 3e4749f7 2020-10-02 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 3e4749f7 2020-10-02 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 3e4749f7 2020-10-02 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 3e4749f7 2020-10-02 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 3e4749f7 2020-10-02 op  */
 16 3e4749f7 2020-10-02 op 
 17 f28f9311 2020-10-14 op #include <sys/mman.h>
 18 3e4749f7 2020-10-02 op #include <sys/socket.h>
 19 3e4749f7 2020-10-02 op #include <sys/stat.h>
 20 3e4749f7 2020-10-02 op 
 21 3e4749f7 2020-10-02 op #include <assert.h>
 22 3e4749f7 2020-10-02 op #include <err.h>
 23 592fd624 2020-10-07 op #include <errno.h>
 24 3e4749f7 2020-10-02 op #include <fcntl.h>
 25 231bfcdc 2020-12-21 op #include <limits.h>
 26 0cf902af 2020-11-03 op #include <signal.h>
 27 3e4749f7 2020-10-02 op #include <string.h>
 28 3e4749f7 2020-10-02 op 
 29 488f059a 2020-12-24 op #include "gmid.h"
 30 cc68fe70 2020-10-07 op 
 31 d7802bb4 2020-12-02 op const char *dir, *cgi;
 32 d7802bb4 2020-12-02 op int dirfd;
 33 721e2325 2020-11-18 op int port;
 34 d7802bb4 2020-12-02 op int foreground;
 35 120381c9 2020-11-06 op int connected_clients;
 36 592fd624 2020-10-07 op 
 37 33d32d1f 2020-12-25 op struct etm {			/* file extension to mime */
 38 33d32d1f 2020-12-25 op 	const char	*mime;
 39 33d32d1f 2020-12-25 op 	const char	*ext;
 40 33d32d1f 2020-12-25 op } filetypes[] = {
 41 33d32d1f 2020-12-25 op 	{"application/pdf",	"pdf"},
 42 33d32d1f 2020-12-25 op 
 43 33d32d1f 2020-12-25 op 	{"image/gif",		"gif"},
 44 33d32d1f 2020-12-25 op 	{"image/jpeg",		"jpg"},
 45 33d32d1f 2020-12-25 op 	{"image/jpeg",		"jpeg"},
 46 33d32d1f 2020-12-25 op 	{"image/png",		"png"},
 47 33d32d1f 2020-12-25 op 	{"image/svg+xml",	"svg"},
 48 33d32d1f 2020-12-25 op 
 49 33d32d1f 2020-12-25 op 	{"text/gemini",		"gemini"},
 50 33d32d1f 2020-12-25 op 	{"text/gemini",		"gmi"},
 51 33d32d1f 2020-12-25 op 	{"text/markdown",	"markdown"},
 52 33d32d1f 2020-12-25 op 	{"text/markdown",	"md"},
 53 33d32d1f 2020-12-25 op 	{"text/plain",		"txt"},
 54 33d32d1f 2020-12-25 op 	{"text/xml",		"xml"},
 55 33d32d1f 2020-12-25 op 
 56 33d32d1f 2020-12-25 op 	{NULL, NULL}
 57 33d32d1f 2020-12-25 op };
 58 33d32d1f 2020-12-25 op 
 59 120381c9 2020-11-06 op void
 60 120381c9 2020-11-06 op siginfo_handler(int sig)
 61 120381c9 2020-11-06 op {
 62 120381c9 2020-11-06 op 	(void)sig;
 63 120381c9 2020-11-06 op }
 64 120381c9 2020-11-06 op 
 65 72f653b6 2020-11-06 op int
 66 72f653b6 2020-11-06 op starts_with(const char *str, const char *prefix)
 67 72f653b6 2020-11-06 op {
 68 72f653b6 2020-11-06 op 	size_t i;
 69 72f653b6 2020-11-06 op 
 70 72f653b6 2020-11-06 op 	for (i = 0; prefix[i] != '\0'; ++i)
 71 72f653b6 2020-11-06 op 		if (str[i] != prefix[i])
 72 72f653b6 2020-11-06 op 			return 0;
 73 72f653b6 2020-11-06 op 	return 1;
 74 72f653b6 2020-11-06 op }
 75 72f653b6 2020-11-06 op 
 76 3e4749f7 2020-10-02 op int
 77 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
 78 3e4749f7 2020-10-02 op {
 79 3e4749f7 2020-10-02 op 	char buf[1030] = {0}; 	/* status + ' ' + max reply len + \r\n\0 */
 80 3e4749f7 2020-10-02 op 	int len;
 81 592fd624 2020-10-07 op 	int ret;
 82 3e4749f7 2020-10-02 op 
 83 592fd624 2020-10-07 op 	client->code = code;
 84 592fd624 2020-10-07 op 	client->meta = reason;
 85 592fd624 2020-10-07 op 	client->state = S_INITIALIZING;
 86 592fd624 2020-10-07 op 
 87 3e4749f7 2020-10-02 op 	len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
 88 3e4749f7 2020-10-02 op 	assert(len < (int)sizeof(buf));
 89 592fd624 2020-10-07 op 	ret = tls_write(client->ctx, buf, len);
 90 592fd624 2020-10-07 op 	if (ret == TLS_WANT_POLLIN) {
 91 592fd624 2020-10-07 op 		pfd->events = POLLIN;
 92 592fd624 2020-10-07 op 		return 0;
 93 592fd624 2020-10-07 op 	}
 94 592fd624 2020-10-07 op 
 95 592fd624 2020-10-07 op 	if (ret == TLS_WANT_POLLOUT) {
 96 592fd624 2020-10-07 op 		pfd->events = POLLOUT;
 97 592fd624 2020-10-07 op 		return 0;
 98 592fd624 2020-10-07 op 	}
 99 592fd624 2020-10-07 op 
100 592fd624 2020-10-07 op 	return 1;
101 3e4749f7 2020-10-02 op }
102 3e4749f7 2020-10-02 op 
103 f28f9311 2020-10-14 op ssize_t
104 f28f9311 2020-10-14 op filesize(int fd)
105 f28f9311 2020-10-14 op {
106 f28f9311 2020-10-14 op 	ssize_t len;
107 f28f9311 2020-10-14 op 
108 f28f9311 2020-10-14 op 	if ((len = lseek(fd, 0, SEEK_END)) == -1)
109 f28f9311 2020-10-14 op 		return -1;
110 f28f9311 2020-10-14 op 	if (lseek(fd, 0, SEEK_SET) == -1)
111 f28f9311 2020-10-14 op 		return -1;
112 f28f9311 2020-10-14 op 	return len;
113 f28f9311 2020-10-14 op }
114 f28f9311 2020-10-14 op 
115 cc68fe70 2020-10-07 op const char *
116 cc68fe70 2020-10-07 op path_ext(const char *path)
117 cc68fe70 2020-10-07 op {
118 cc68fe70 2020-10-07 op 	const char *end;
119 cc68fe70 2020-10-07 op 
120 cc68fe70 2020-10-07 op 	end = path + strlen(path)-1; /* the last byte before the NUL */
121 cc68fe70 2020-10-07 op 	for (; end != path; --end) {
122 cc68fe70 2020-10-07 op 		if (*end == '.')
123 cc68fe70 2020-10-07 op 			return end+1;
124 cc68fe70 2020-10-07 op 		if (*end == '/')
125 cc68fe70 2020-10-07 op 			break;
126 cc68fe70 2020-10-07 op 	}
127 cc68fe70 2020-10-07 op 
128 cc68fe70 2020-10-07 op 	return NULL;
129 cc68fe70 2020-10-07 op }
130 cc68fe70 2020-10-07 op 
131 cc68fe70 2020-10-07 op const char *
132 cc68fe70 2020-10-07 op mime(const char *path)
133 cc68fe70 2020-10-07 op {
134 cc68fe70 2020-10-07 op 	const char *ext, *def = "application/octet-stream";
135 cc68fe70 2020-10-07 op 	struct etm *t;
136 cc68fe70 2020-10-07 op 
137 cc68fe70 2020-10-07 op 	if ((ext = path_ext(path)) == NULL)
138 cc68fe70 2020-10-07 op 		return def;
139 cc68fe70 2020-10-07 op 
140 cc68fe70 2020-10-07 op 	for (t = filetypes; t->mime != NULL; ++t)
141 cc68fe70 2020-10-07 op 		if (!strcmp(ext, t->ext))
142 cc68fe70 2020-10-07 op 			return t->mime;
143 cc68fe70 2020-10-07 op 
144 cc68fe70 2020-10-07 op 	return def;
145 3e4749f7 2020-10-02 op }
146 3e4749f7 2020-10-02 op 
147 f28f9311 2020-10-14 op int
148 d7802bb4 2020-12-02 op check_path(struct client *c, const char *path, int *fd)
149 3e4749f7 2020-10-02 op {
150 72342dc9 2020-11-06 op 	struct stat sb;
151 3e4749f7 2020-10-02 op 
152 f28f9311 2020-10-14 op 	assert(path != NULL);
153 33d32d1f 2020-12-25 op 	if ((*fd = openat(dirfd, *path ? path : ".",
154 a5d310bc 2020-11-10 op 		    O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
155 a5d310bc 2020-11-10 op 		return FILE_MISSING;
156 a5d310bc 2020-11-10 op 	}
157 a5d310bc 2020-11-10 op 
158 a5d310bc 2020-11-10 op 	if (fstat(*fd, &sb) == -1) {
159 d7802bb4 2020-12-02 op 		LOGN(c, "failed stat for %s: %s", path, strerror(errno));
160 a5d310bc 2020-11-10 op 		return FILE_MISSING;
161 a5d310bc 2020-11-10 op 	}
162 a5d310bc 2020-11-10 op 
163 a5d310bc 2020-11-10 op 	if (S_ISDIR(sb.st_mode))
164 a5d310bc 2020-11-10 op 		return FILE_DIRECTORY;
165 a5d310bc 2020-11-10 op 
166 a5d310bc 2020-11-10 op 	if (sb.st_mode & S_IXUSR)
167 a5d310bc 2020-11-10 op 		return FILE_EXECUTABLE;
168 a5d310bc 2020-11-10 op 
169 a5d310bc 2020-11-10 op 	return FILE_EXISTS;
170 a5d310bc 2020-11-10 op }
171 a5d310bc 2020-11-10 op 
172 a5d310bc 2020-11-10 op /*
173 a5d310bc 2020-11-10 op  * the inverse of this algorithm, i.e. starting from the start of the
174 a5d310bc 2020-11-10 op  * path + strlen(cgi), and checking if each component, should be
175 a5d310bc 2020-11-10 op  * faster.  But it's tedious to write.  This does the opposite: starts
176 a5d310bc 2020-11-10 op  * from the end and strip one component at a time, until either an
177 a5d310bc 2020-11-10 op  * executable is found or we emptied the path.
178 a5d310bc 2020-11-10 op  */
179 a5d310bc 2020-11-10 op int
180 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
181 a5d310bc 2020-11-10 op {
182 a5d310bc 2020-11-10 op 	char *end;
183 a5d310bc 2020-11-10 op 	end = strchr(path, '\0');
184 a5d310bc 2020-11-10 op 
185 a5d310bc 2020-11-10 op 	/* NB: assume CGI is enabled and path matches cgi */
186 a5d310bc 2020-11-10 op 
187 a5d310bc 2020-11-10 op 	while (end > path) {
188 a5d310bc 2020-11-10 op 		/* go up one level.  UNIX paths are simple and POSIX
189 a5d310bc 2020-11-10 op 		 * dirname, with its ambiguities on if the given path
190 a5d310bc 2020-11-10 op 		 * is changed or not, gives me headaches. */
191 a5d310bc 2020-11-10 op 		while (*end != '/')
192 a5d310bc 2020-11-10 op 			end--;
193 a5d310bc 2020-11-10 op 		*end = '\0';
194 3e4749f7 2020-10-02 op 
195 d7802bb4 2020-12-02 op 		switch (check_path(c, path, &c->fd)) {
196 a5d310bc 2020-11-10 op 		case FILE_EXECUTABLE:
197 a5d310bc 2020-11-10 op 			return start_cgi(path, end+1, query, fds,c);
198 a5d310bc 2020-11-10 op 		case FILE_MISSING:
199 a5d310bc 2020-11-10 op 			break;
200 a5d310bc 2020-11-10 op 		default:
201 a5d310bc 2020-11-10 op 			goto err;
202 a5d310bc 2020-11-10 op 		}
203 a5d310bc 2020-11-10 op 
204 a5d310bc 2020-11-10 op 		*end = '/';
205 a5d310bc 2020-11-10 op 		end--;
206 a5d310bc 2020-11-10 op 	}
207 a5d310bc 2020-11-10 op 
208 a5d310bc 2020-11-10 op err:
209 a5d310bc 2020-11-10 op 	if (!start_reply(fds, c, NOT_FOUND, "not found"))
210 a5d310bc 2020-11-10 op 		return 0;
211 a5d310bc 2020-11-10 op 	goodbye(fds, c);
212 a5d310bc 2020-11-10 op 	return 0;
213 a5d310bc 2020-11-10 op }
214 a5d310bc 2020-11-10 op 
215 a5d310bc 2020-11-10 op 
216 a5d310bc 2020-11-10 op int
217 33d32d1f 2020-12-25 op open_file(char *fpath, char *query, struct pollfd *fds, struct client *c)
218 a5d310bc 2020-11-10 op {
219 d7802bb4 2020-12-02 op 	switch (check_path(c, fpath, &c->fd)) {
220 a5d310bc 2020-11-10 op 	case FILE_EXECUTABLE:
221 a5d310bc 2020-11-10 op 		/* +2 to skip the ./ */
222 a5d310bc 2020-11-10 op 		if (cgi != NULL && starts_with(fpath+2, cgi))
223 a5d310bc 2020-11-10 op 			return start_cgi(fpath, "", query, fds, c);
224 3e4749f7 2020-10-02 op 
225 a5d310bc 2020-11-10 op 		/* fallthrough */
226 a5d310bc 2020-11-10 op 
227 a5d310bc 2020-11-10 op 	case FILE_EXISTS:
228 a5d310bc 2020-11-10 op 		if ((c->len = filesize(c->fd)) == -1) {
229 d7802bb4 2020-12-02 op 			LOGE(c, "failed to get file size for %s", fpath);
230 a5d310bc 2020-11-10 op 			goodbye(fds, c);
231 72342dc9 2020-11-06 op 			return 0;
232 a5d310bc 2020-11-10 op 		}
233 72342dc9 2020-11-06 op 
234 a5d310bc 2020-11-10 op 		if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
235 a5d310bc 2020-11-10 op 			    c->fd, 0)) == MAP_FAILED) {
236 a5d310bc 2020-11-10 op 			warn("mmap: %s", fpath);
237 a5d310bc 2020-11-10 op 			goodbye(fds, c);
238 a5d310bc 2020-11-10 op 			return 0;
239 a5d310bc 2020-11-10 op 		}
240 a5d310bc 2020-11-10 op 		c->i = c->buf;
241 a5d310bc 2020-11-10 op 		return start_reply(fds, c, SUCCESS, mime(fpath));
242 a5d310bc 2020-11-10 op 
243 a5d310bc 2020-11-10 op 	case FILE_DIRECTORY:
244 d7802bb4 2020-12-02 op 		LOGD(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
245 f28f9311 2020-10-14 op 		close(c->fd);
246 f28f9311 2020-10-14 op 		c->fd = -1;
247 f28f9311 2020-10-14 op 		send_dir(fpath, fds, c);
248 f28f9311 2020-10-14 op 		return 0;
249 3e4749f7 2020-10-02 op 
250 a5d310bc 2020-11-10 op 	case FILE_MISSING:
251 a5d310bc 2020-11-10 op 		if (cgi != NULL && starts_with(fpath+2, cgi))
252 a5d310bc 2020-11-10 op 			return check_for_cgi(fpath, query, fds, c);
253 72342dc9 2020-11-06 op 
254 a5d310bc 2020-11-10 op 		if (!start_reply(fds, c, NOT_FOUND, "not found"))
255 a5d310bc 2020-11-10 op 			return 0;
256 f28f9311 2020-10-14 op 		goodbye(fds, c);
257 f28f9311 2020-10-14 op 		return 0;
258 f28f9311 2020-10-14 op 
259 a5d310bc 2020-11-10 op 	default:
260 a5d310bc 2020-11-10 op 		/* unreachable */
261 a5d310bc 2020-11-10 op 		abort();
262 592fd624 2020-10-07 op 	}
263 72342dc9 2020-11-06 op }
264 72342dc9 2020-11-06 op 
265 a5d310bc 2020-11-10 op int
266 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
267 75d233f0 2020-11-06 op     struct pollfd *fds, struct client *c)
268 72342dc9 2020-11-06 op {
269 72342dc9 2020-11-06 op 	pid_t pid;
270 a5d310bc 2020-11-10 op 	int p[2]; 		/* read end, write end */
271 72342dc9 2020-11-06 op 
272 72342dc9 2020-11-06 op 	if (pipe(p) == -1)
273 72342dc9 2020-11-06 op 		goto err;
274 72342dc9 2020-11-06 op 
275 72342dc9 2020-11-06 op 	switch (pid = fork()) {
276 72342dc9 2020-11-06 op 	case -1:
277 72342dc9 2020-11-06 op 		goto err;
278 72342dc9 2020-11-06 op 
279 a5d310bc 2020-11-10 op 	case 0: { 		/* child */
280 721e2325 2020-11-18 op 		char *ex, *requri, *portno;
281 72342dc9 2020-11-06 op 		char addr[INET_ADDRSTRLEN];
282 72342dc9 2020-11-06 op 		char *argv[] = { NULL, NULL, NULL };
283 72342dc9 2020-11-06 op 
284 a5d310bc 2020-11-10 op 		spath++;
285 72342dc9 2020-11-06 op 
286 a5d310bc 2020-11-10 op 		close(p[0]);
287 72342dc9 2020-11-06 op 		if (dup2(p[1], 1) == -1)
288 72342dc9 2020-11-06 op 			goto childerr;
289 72342dc9 2020-11-06 op 
290 72342dc9 2020-11-06 op 		if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
291 a5d310bc 2020-11-10 op 			goto childerr;
292 72342dc9 2020-11-06 op 
293 721e2325 2020-11-18 op 		if (asprintf(&portno, "%d", port) == -1)
294 721e2325 2020-11-18 op 			goto childerr;
295 721e2325 2020-11-18 op 
296 a5d310bc 2020-11-10 op 		if (asprintf(&ex, "%s%s", dir, spath+1) == -1)
297 72342dc9 2020-11-06 op 			goto childerr;
298 72342dc9 2020-11-06 op 
299 a5d310bc 2020-11-10 op 		if (asprintf(&requri, "%s%s%s", spath,
300 a5d310bc 2020-11-10 op 		    *relpath == '\0' ? "" : "/",
301 a5d310bc 2020-11-10 op 		    relpath) == -1)
302 a5d310bc 2020-11-10 op 			goto childerr;
303 a5d310bc 2020-11-10 op 
304 a5d310bc 2020-11-10 op 		argv[0] = argv[1] = ex;
305 a5d310bc 2020-11-10 op 
306 60ba426e 2020-11-06 op 		/* fix the env */
307 677afbd3 2020-12-02 op 		SAFE_SETENV("GATEWAY_INTERFACE", "CGI/1.1");
308 677afbd3 2020-12-02 op 		SAFE_SETENV("SERVER_SOFTWARE", "gmid");
309 677afbd3 2020-12-02 op 		SAFE_SETENV("SERVER_PORT", portno);
310 a5d310bc 2020-11-10 op 		/* setenv("SERVER_NAME", "", 1); */
311 677afbd3 2020-12-02 op 		SAFE_SETENV("SCRIPT_NAME", spath);
312 677afbd3 2020-12-02 op 		SAFE_SETENV("SCRIPT_EXECUTABLE", ex);
313 677afbd3 2020-12-02 op 		SAFE_SETENV("REQUEST_URI", requri);
314 677afbd3 2020-12-02 op 		SAFE_SETENV("REQUEST_RELATIVE", relpath);
315 677afbd3 2020-12-02 op 		SAFE_SETENV("QUERY_STRING", query);
316 677afbd3 2020-12-02 op 		SAFE_SETENV("REMOTE_HOST", addr);
317 677afbd3 2020-12-02 op 		SAFE_SETENV("REMOTE_ADDR", addr);
318 677afbd3 2020-12-02 op 		SAFE_SETENV("DOCUMENT_ROOT", dir);
319 72342dc9 2020-11-06 op 
320 677afbd3 2020-12-02 op 		if (tls_peer_cert_provided(c->ctx)) {
321 677afbd3 2020-12-02 op 			SAFE_SETENV("AUTH_TYPE", "Certificate");
322 677afbd3 2020-12-02 op 			SAFE_SETENV("REMOTE_USER", tls_peer_cert_subject(c->ctx));
323 677afbd3 2020-12-02 op 			SAFE_SETENV("TLS_CLIENT_ISSUER", tls_peer_cert_issuer(c->ctx));
324 677afbd3 2020-12-02 op 			SAFE_SETENV("TLS_CLIENT_HASH", tls_peer_cert_hash(c->ctx));
325 677afbd3 2020-12-02 op 		}
326 677afbd3 2020-12-02 op 
327 a5d310bc 2020-11-10 op 		execvp(ex, argv);
328 72342dc9 2020-11-06 op 		goto childerr;
329 72342dc9 2020-11-06 op 	}
330 72342dc9 2020-11-06 op 
331 72342dc9 2020-11-06 op 	default:		/* parent */
332 a5d310bc 2020-11-10 op 		close(p[1]);
333 72342dc9 2020-11-06 op 		close(c->fd);
334 72342dc9 2020-11-06 op 		c->fd = p[0];
335 72342dc9 2020-11-06 op 		c->child = pid;
336 aff8d190 2020-11-06 op 		mark_nonblock(c->fd);
337 aff8d190 2020-11-06 op 		c->state = S_SENDING;
338 72342dc9 2020-11-06 op 		handle_cgi(fds, c);
339 a5d310bc 2020-11-10 op 		return 0;
340 72342dc9 2020-11-06 op 	}
341 72342dc9 2020-11-06 op 
342 72342dc9 2020-11-06 op err:
343 72342dc9 2020-11-06 op 	if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
344 a5d310bc 2020-11-10 op 		return 0;
345 72342dc9 2020-11-06 op 	goodbye(fds, c);
346 a5d310bc 2020-11-10 op 	return 0;
347 72342dc9 2020-11-06 op 
348 72342dc9 2020-11-06 op childerr:
349 72342dc9 2020-11-06 op 	dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
350 72342dc9 2020-11-06 op 	close(p[1]);
351 a5d310bc 2020-11-10 op 	_exit(1);
352 72342dc9 2020-11-06 op }
353 72342dc9 2020-11-06 op 
354 72342dc9 2020-11-06 op void
355 aff8d190 2020-11-06 op cgi_setpoll_on_child(struct pollfd *fds, struct client *c)
356 72342dc9 2020-11-06 op {
357 aff8d190 2020-11-06 op 	int fd;
358 72342dc9 2020-11-06 op 
359 aff8d190 2020-11-06 op 	if (c->waiting_on_child)
360 aff8d190 2020-11-06 op 		return;
361 aff8d190 2020-11-06 op 	c->waiting_on_child = 1;
362 aff8d190 2020-11-06 op 
363 aff8d190 2020-11-06 op 	fds->events = POLLIN;
364 aff8d190 2020-11-06 op 
365 aff8d190 2020-11-06 op 	fd = fds->fd;
366 aff8d190 2020-11-06 op 	fds->fd = c->fd;
367 aff8d190 2020-11-06 op 	c->fd = fd;
368 aff8d190 2020-11-06 op }
369 aff8d190 2020-11-06 op 
370 aff8d190 2020-11-06 op void
371 aff8d190 2020-11-06 op cgi_setpoll_on_client(struct pollfd *fds, struct client *c)
372 aff8d190 2020-11-06 op {
373 aff8d190 2020-11-06 op 	int fd;
374 aff8d190 2020-11-06 op 
375 aff8d190 2020-11-06 op 	if (!c->waiting_on_child)
376 aff8d190 2020-11-06 op 		return;
377 aff8d190 2020-11-06 op 	c->waiting_on_child = 0;
378 aff8d190 2020-11-06 op 
379 aff8d190 2020-11-06 op 	fd = fds->fd;
380 aff8d190 2020-11-06 op 	fds->fd = c->fd;
381 aff8d190 2020-11-06 op 	c->fd = fd;
382 aff8d190 2020-11-06 op }
383 aff8d190 2020-11-06 op 
384 aff8d190 2020-11-06 op void
385 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
386 aff8d190 2020-11-06 op {
387 aff8d190 2020-11-06 op 	ssize_t r;
388 aff8d190 2020-11-06 op 
389 aff8d190 2020-11-06 op 	/* ensure c->fd is the child and fds->fd the client */
390 aff8d190 2020-11-06 op 	cgi_setpoll_on_client(fds, c);
391 aff8d190 2020-11-06 op 
392 72342dc9 2020-11-06 op 	while (1) {
393 aff8d190 2020-11-06 op 		if (c->len == 0) {
394 aff8d190 2020-11-06 op 			if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
395 aff8d190 2020-11-06 op 				goto end;
396 aff8d190 2020-11-06 op 			if (r == -1) {
397 aff8d190 2020-11-06 op 				if (errno == EAGAIN || errno == EWOULDBLOCK) {
398 aff8d190 2020-11-06 op 					cgi_setpoll_on_child(fds, c);
399 aff8d190 2020-11-06 op 					return;
400 aff8d190 2020-11-06 op 				}
401 aff8d190 2020-11-06 op                                 goto end;
402 aff8d190 2020-11-06 op 			}
403 aff8d190 2020-11-06 op 			c->len = r;
404 aff8d190 2020-11-06 op 			c->off = 0;
405 aff8d190 2020-11-06 op 		}
406 aff8d190 2020-11-06 op 
407 aff8d190 2020-11-06 op 		while (c->len > 0) {
408 aff8d190 2020-11-06 op 			switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
409 72342dc9 2020-11-06 op 			case -1:
410 72342dc9 2020-11-06 op 				goto end;
411 72342dc9 2020-11-06 op 
412 72342dc9 2020-11-06 op 			case TLS_WANT_POLLOUT:
413 aff8d190 2020-11-06 op 				fds->events = POLLOUT;
414 aff8d190 2020-11-06 op 				return;
415 aff8d190 2020-11-06 op 
416 72342dc9 2020-11-06 op 			case TLS_WANT_POLLIN:
417 aff8d190 2020-11-06 op 				fds->events = POLLIN;
418 aff8d190 2020-11-06 op 				return;
419 72342dc9 2020-11-06 op 
420 72342dc9 2020-11-06 op 			default:
421 aff8d190 2020-11-06 op                                 c->off += r;
422 aff8d190 2020-11-06 op 				c->len -= r;
423 aff8d190 2020-11-06 op 				break;
424 72342dc9 2020-11-06 op 			}
425 72342dc9 2020-11-06 op 		}
426 72342dc9 2020-11-06 op 	}
427 72342dc9 2020-11-06 op 
428 72342dc9 2020-11-06 op end:
429 72342dc9 2020-11-06 op 	goodbye(fds, c);
430 f28f9311 2020-10-14 op }
431 592fd624 2020-10-07 op 
432 f28f9311 2020-10-14 op void
433 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
434 f28f9311 2020-10-14 op {
435 f28f9311 2020-10-14 op 	ssize_t ret, len;
436 592fd624 2020-10-07 op 
437 f28f9311 2020-10-14 op 	if (c->fd == -1) {
438 75d233f0 2020-11-06 op 		if (!open_file(path, query, fds, c))
439 f28f9311 2020-10-14 op 			return;
440 f28f9311 2020-10-14 op 		c->state = S_SENDING;
441 f28f9311 2020-10-14 op 	}
442 592fd624 2020-10-07 op 
443 f28f9311 2020-10-14 op 	len = (c->buf + c->len) - c->i;
444 f28f9311 2020-10-14 op 
445 f28f9311 2020-10-14 op 	while (len > 0) {
446 f28f9311 2020-10-14 op 		switch (ret = tls_write(c->ctx, c->i, len)) {
447 f28f9311 2020-10-14 op 		case -1:
448 d7802bb4 2020-12-02 op 			LOGE(c, "tls_write: %s", tls_error(c->ctx));
449 f28f9311 2020-10-14 op 			goodbye(fds, c);
450 f28f9311 2020-10-14 op 			return;
451 f28f9311 2020-10-14 op 
452 f28f9311 2020-10-14 op 		case TLS_WANT_POLLIN:
453 f28f9311 2020-10-14 op 			fds->events = POLLIN;
454 f28f9311 2020-10-14 op 			return;
455 f28f9311 2020-10-14 op 
456 f28f9311 2020-10-14 op 		case TLS_WANT_POLLOUT:
457 f28f9311 2020-10-14 op 			fds->events = POLLOUT;
458 f28f9311 2020-10-14 op 			return;
459 f28f9311 2020-10-14 op 
460 f28f9311 2020-10-14 op 		default:
461 f28f9311 2020-10-14 op 			c->i += ret;
462 f28f9311 2020-10-14 op 			len -= ret;
463 f28f9311 2020-10-14 op 			break;
464 3e4749f7 2020-10-02 op 		}
465 3e4749f7 2020-10-02 op 	}
466 f28f9311 2020-10-14 op 
467 f28f9311 2020-10-14 op 	goodbye(fds, c);
468 3e4749f7 2020-10-02 op }
469 3e4749f7 2020-10-02 op 
470 3e4749f7 2020-10-02 op void
471 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
472 3e4749f7 2020-10-02 op {
473 3e4749f7 2020-10-02 op 	char fpath[PATHBUF];
474 3e4749f7 2020-10-02 op 	size_t len;
475 3e4749f7 2020-10-02 op 
476 3e4749f7 2020-10-02 op 	bzero(fpath, PATHBUF);
477 3e4749f7 2020-10-02 op 
478 9c56b0a7 2020-10-14 op 	if (path[0] != '.')
479 3e4749f7 2020-10-02 op 		fpath[0] = '.';
480 3e4749f7 2020-10-02 op 
481 3e4749f7 2020-10-02 op 	/* this cannot fail since sizeof(fpath) > maxlen of path */
482 3e4749f7 2020-10-02 op 	strlcat(fpath, path, PATHBUF);
483 3e4749f7 2020-10-02 op 	len = strlen(fpath);
484 3e4749f7 2020-10-02 op 
485 3e4749f7 2020-10-02 op 	/* add a trailing / in case. */
486 3e4749f7 2020-10-02 op 	if (fpath[len-1] != '/') {
487 3e4749f7 2020-10-02 op 		fpath[len] = '/';
488 3e4749f7 2020-10-02 op 	}
489 3e4749f7 2020-10-02 op 
490 3e4749f7 2020-10-02 op 	strlcat(fpath, "index.gmi", sizeof(fpath));
491 3e4749f7 2020-10-02 op 
492 75d233f0 2020-11-06 op 	send_file(fpath, NULL, fds, client);
493 3e4749f7 2020-10-02 op }
494 3e4749f7 2020-10-02 op 
495 3e4749f7 2020-10-02 op void
496 592fd624 2020-10-07 op handle(struct pollfd *fds, struct client *client)
497 3e4749f7 2020-10-02 op {
498 592fd624 2020-10-07 op 	char buf[GEMINI_URL_LEN];
499 33d32d1f 2020-12-25 op 	const char *parse_err;
500 33d32d1f 2020-12-25 op 	struct uri uri;
501 3e4749f7 2020-10-02 op 
502 592fd624 2020-10-07 op 	switch (client->state) {
503 592fd624 2020-10-07 op 	case S_OPEN:
504 592fd624 2020-10-07 op 		bzero(buf, GEMINI_URL_LEN);
505 592fd624 2020-10-07 op 		switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
506 592fd624 2020-10-07 op 		case -1:
507 d7802bb4 2020-12-02 op 			LOGE(client, "tls_read: %s", tls_error(client->ctx));
508 592fd624 2020-10-07 op 			goodbye(fds, client);
509 592fd624 2020-10-07 op 			return;
510 3e4749f7 2020-10-02 op 
511 592fd624 2020-10-07 op 		case TLS_WANT_POLLIN:
512 592fd624 2020-10-07 op 			fds->events = POLLIN;
513 592fd624 2020-10-07 op 			return;
514 3e4749f7 2020-10-02 op 
515 592fd624 2020-10-07 op 		case TLS_WANT_POLLOUT:
516 592fd624 2020-10-07 op 			fds->events = POLLOUT;
517 592fd624 2020-10-07 op 			return;
518 592fd624 2020-10-07 op 		}
519 3e4749f7 2020-10-02 op 
520 33d32d1f 2020-12-25 op 		if (!trim_req_uri(buf) || !parse_uri(buf, &uri, &parse_err)) {
521 33d32d1f 2020-12-25 op 			if (!start_reply(fds, client, BAD_REQUEST, parse_err))
522 592fd624 2020-10-07 op 				return;
523 592fd624 2020-10-07 op 			goodbye(fds, client);
524 592fd624 2020-10-07 op 			return;
525 592fd624 2020-10-07 op 		}
526 592fd624 2020-10-07 op 
527 33d32d1f 2020-12-25 op 		LOGI(client, "GET %s%s%s",
528 33d32d1f 2020-12-25 op 		    *uri.path ? uri.path : "/",
529 33d32d1f 2020-12-25 op 		    *uri.query ? "?" : "",
530 33d32d1f 2020-12-25 op 		    *uri.query ? uri.query : "");
531 592fd624 2020-10-07 op 
532 33d32d1f 2020-12-25 op 		send_file(uri.path, uri.query, fds, client);
533 592fd624 2020-10-07 op 		break;
534 592fd624 2020-10-07 op 
535 592fd624 2020-10-07 op 	case S_INITIALIZING:
536 592fd624 2020-10-07 op 		if (!start_reply(fds, client, client->code, client->meta))
537 592fd624 2020-10-07 op 			return;
538 592fd624 2020-10-07 op 
539 592fd624 2020-10-07 op 		if (client->code != SUCCESS) {
540 592fd624 2020-10-07 op 			/* we don't need a body */
541 592fd624 2020-10-07 op 			goodbye(fds, client);
542 592fd624 2020-10-07 op 			return;
543 592fd624 2020-10-07 op 		}
544 592fd624 2020-10-07 op 
545 592fd624 2020-10-07 op 		client->state = S_SENDING;
546 592fd624 2020-10-07 op 
547 592fd624 2020-10-07 op 		/* fallthrough */
548 592fd624 2020-10-07 op 
549 592fd624 2020-10-07 op 	case S_SENDING:
550 aff8d190 2020-11-06 op 		if (client->child != -1)
551 aff8d190 2020-11-06 op 			handle_cgi(fds, client);
552 aff8d190 2020-11-06 op 		else
553 aff8d190 2020-11-06 op 			send_file(NULL, NULL, fds, client);
554 592fd624 2020-10-07 op 		break;
555 592fd624 2020-10-07 op 
556 592fd624 2020-10-07 op 	case S_CLOSING:
557 592fd624 2020-10-07 op 		goodbye(fds, client);
558 592fd624 2020-10-07 op 		break;
559 592fd624 2020-10-07 op 
560 592fd624 2020-10-07 op 	default:
561 592fd624 2020-10-07 op 		/* unreachable */
562 592fd624 2020-10-07 op 		abort();
563 592fd624 2020-10-07 op 	}
564 3e4749f7 2020-10-02 op }
565 3e4749f7 2020-10-02 op 
566 592fd624 2020-10-07 op void
567 592fd624 2020-10-07 op mark_nonblock(int fd)
568 592fd624 2020-10-07 op {
569 592fd624 2020-10-07 op 	int flags;
570 592fd624 2020-10-07 op 
571 592fd624 2020-10-07 op 	if ((flags = fcntl(fd, F_GETFL)) == -1)
572 d7802bb4 2020-12-02 op 		FATAL("fcntl(F_GETFL): %s", strerror(errno));
573 592fd624 2020-10-07 op 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
574 d7802bb4 2020-12-02 op 		FATAL("fcntl(F_SETFL): %s", strerror(errno));
575 592fd624 2020-10-07 op }
576 592fd624 2020-10-07 op 
577 3e4749f7 2020-10-02 op int
578 9468027b 2020-10-15 op make_socket(int port, int family)
579 3e4749f7 2020-10-02 op {
580 3e4749f7 2020-10-02 op 	int sock, v;
581 9468027b 2020-10-15 op 	struct sockaddr_in addr4;
582 9468027b 2020-10-15 op 	struct sockaddr_in6 addr6;
583 9468027b 2020-10-15 op 	struct sockaddr *addr;
584 9468027b 2020-10-15 op 	socklen_t len;
585 3e4749f7 2020-10-02 op 
586 9468027b 2020-10-15 op         switch (family) {
587 9468027b 2020-10-15 op 	case AF_INET:
588 9468027b 2020-10-15 op 		bzero(&addr4, sizeof(addr4));
589 9468027b 2020-10-15 op 		addr4.sin_family = family;
590 9468027b 2020-10-15 op 		addr4.sin_port = htons(port);
591 9468027b 2020-10-15 op 		addr4.sin_addr.s_addr = INADDR_ANY;
592 9468027b 2020-10-15 op 		addr = (struct sockaddr*)&addr4;
593 9468027b 2020-10-15 op 		len = sizeof(addr4);
594 9468027b 2020-10-15 op 		break;
595 9468027b 2020-10-15 op 
596 9468027b 2020-10-15 op 	case AF_INET6:
597 9468027b 2020-10-15 op 		bzero(&addr6, sizeof(addr6));
598 9468027b 2020-10-15 op 		addr6.sin6_family = AF_INET6;
599 9468027b 2020-10-15 op 		addr6.sin6_port = htons(port);
600 9468027b 2020-10-15 op 		addr6.sin6_addr = in6addr_any;
601 9468027b 2020-10-15 op 		addr = (struct sockaddr*)&addr6;
602 9468027b 2020-10-15 op 		len = sizeof(addr6);
603 9468027b 2020-10-15 op 		break;
604 9468027b 2020-10-15 op 
605 9468027b 2020-10-15 op 	default:
606 9468027b 2020-10-15 op 		/* unreachable */
607 9468027b 2020-10-15 op 		abort();
608 9468027b 2020-10-15 op 	}
609 9468027b 2020-10-15 op 
610 9468027b 2020-10-15 op 	if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
611 d7802bb4 2020-12-02 op 		FATAL("socket: %s", strerror(errno));
612 3e4749f7 2020-10-02 op 
613 3e4749f7 2020-10-02 op 	v = 1;
614 3e4749f7 2020-10-02 op 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
615 d7802bb4 2020-12-02 op 		FATAL("setsockopt(SO_REUSEADDR): %s", strerror(errno));
616 3e4749f7 2020-10-02 op 
617 3e4749f7 2020-10-02 op 	v = 1;
618 3e4749f7 2020-10-02 op 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
619 d7802bb4 2020-12-02 op 		FATAL("setsockopt(SO_REUSEPORT): %s", strerror(errno));
620 3e4749f7 2020-10-02 op 
621 592fd624 2020-10-07 op 	mark_nonblock(sock);
622 592fd624 2020-10-07 op 
623 9468027b 2020-10-15 op 	if (bind(sock, addr, len) == -1)
624 d7802bb4 2020-12-02 op 		FATAL("bind: %s", strerror(errno));
625 3e4749f7 2020-10-02 op 
626 3e4749f7 2020-10-02 op 	if (listen(sock, 16) == -1)
627 d7802bb4 2020-12-02 op 		FATAL("listen: %s", strerror(errno));
628 3e4749f7 2020-10-02 op 
629 3e4749f7 2020-10-02 op 	return sock;
630 3e4749f7 2020-10-02 op }
631 3e4749f7 2020-10-02 op 
632 3e4749f7 2020-10-02 op void
633 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
634 3e4749f7 2020-10-02 op {
635 592fd624 2020-10-07 op 	int i, fd;
636 592fd624 2020-10-07 op 	struct sockaddr_in addr;
637 3e4749f7 2020-10-02 op 	socklen_t len;
638 3e4749f7 2020-10-02 op 
639 592fd624 2020-10-07 op 	len = sizeof(addr);
640 592fd624 2020-10-07 op 	if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
641 592fd624 2020-10-07 op 		if (errno == EWOULDBLOCK)
642 592fd624 2020-10-07 op 			return;
643 d7802bb4 2020-12-02 op 		FATAL("accept: %s", strerror(errno));
644 592fd624 2020-10-07 op 	}
645 3e4749f7 2020-10-02 op 
646 592fd624 2020-10-07 op 	mark_nonblock(fd);
647 3e4749f7 2020-10-02 op 
648 592fd624 2020-10-07 op 	for (i = 0; i < MAX_USERS; ++i) {
649 592fd624 2020-10-07 op 		if (fds[i].fd == -1) {
650 592fd624 2020-10-07 op 			bzero(&clients[i], sizeof(struct client));
651 592fd624 2020-10-07 op 			if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
652 592fd624 2020-10-07 op 				break; /* goodbye fd! */
653 592fd624 2020-10-07 op 
654 592fd624 2020-10-07 op 			fds[i].fd = fd;
655 592fd624 2020-10-07 op 			fds[i].events = POLLIN;
656 592fd624 2020-10-07 op 
657 592fd624 2020-10-07 op 			clients[i].state = S_OPEN;
658 592fd624 2020-10-07 op 			clients[i].fd = -1;
659 72342dc9 2020-11-06 op 			clients[i].child = -1;
660 f28f9311 2020-10-14 op 			clients[i].buf = MAP_FAILED;
661 2c3a40fa 2020-11-06 op 			clients[i].af = AF_INET;
662 2c3a40fa 2020-11-06 op 			clients[i].addr = addr.sin_addr;
663 592fd624 2020-10-07 op 
664 120381c9 2020-11-06 op 			connected_clients++;
665 592fd624 2020-10-07 op 			return;
666 3e4749f7 2020-10-02 op 		}
667 592fd624 2020-10-07 op 	}
668 3e4749f7 2020-10-02 op 
669 592fd624 2020-10-07 op 	close(fd);
670 592fd624 2020-10-07 op }
671 3e4749f7 2020-10-02 op 
672 592fd624 2020-10-07 op void
673 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
674 592fd624 2020-10-07 op {
675 592fd624 2020-10-07 op 	ssize_t ret;
676 592fd624 2020-10-07 op 
677 592fd624 2020-10-07 op 	c->state = S_CLOSING;
678 592fd624 2020-10-07 op 
679 592fd624 2020-10-07 op 	ret = tls_close(c->ctx);
680 592fd624 2020-10-07 op 	if (ret == TLS_WANT_POLLIN) {
681 592fd624 2020-10-07 op 		pfd->events = POLLIN;
682 592fd624 2020-10-07 op 		return;
683 3e4749f7 2020-10-02 op 	}
684 592fd624 2020-10-07 op 	if (ret == TLS_WANT_POLLOUT) {
685 592fd624 2020-10-07 op 		pfd->events = POLLOUT;
686 592fd624 2020-10-07 op 		return;
687 592fd624 2020-10-07 op 	}
688 592fd624 2020-10-07 op 
689 120381c9 2020-11-06 op 	connected_clients--;
690 120381c9 2020-11-06 op 
691 592fd624 2020-10-07 op 	tls_free(c->ctx);
692 592fd624 2020-10-07 op 	c->ctx = NULL;
693 592fd624 2020-10-07 op 
694 f28f9311 2020-10-14 op 	if (c->buf != MAP_FAILED)
695 f28f9311 2020-10-14 op 		munmap(c->buf, c->len);
696 f28f9311 2020-10-14 op 
697 592fd624 2020-10-07 op 	if (c->fd != -1)
698 592fd624 2020-10-07 op 		close(c->fd);
699 592fd624 2020-10-07 op 
700 592fd624 2020-10-07 op 	close(pfd->fd);
701 592fd624 2020-10-07 op 	pfd->fd = -1;
702 3e4749f7 2020-10-02 op }
703 3e4749f7 2020-10-02 op 
704 3e4749f7 2020-10-02 op void
705 592fd624 2020-10-07 op loop(struct tls *ctx, int sock)
706 592fd624 2020-10-07 op {
707 592fd624 2020-10-07 op 	int i, todo;
708 592fd624 2020-10-07 op 	struct client clients[MAX_USERS];
709 592fd624 2020-10-07 op 	struct pollfd fds[MAX_USERS];
710 592fd624 2020-10-07 op 
711 592fd624 2020-10-07 op 	for (i = 0; i < MAX_USERS; ++i) {
712 592fd624 2020-10-07 op 		fds[i].fd = -1;
713 592fd624 2020-10-07 op 		fds[i].events = POLLIN;
714 592fd624 2020-10-07 op 		bzero(&clients[i], sizeof(struct client));
715 592fd624 2020-10-07 op 	}
716 592fd624 2020-10-07 op 
717 592fd624 2020-10-07 op 	fds[0].fd = sock;
718 592fd624 2020-10-07 op 
719 592fd624 2020-10-07 op 	for (;;) {
720 120381c9 2020-11-06 op 		if ((todo = poll(fds, MAX_USERS, INFTIM)) == -1) {
721 120381c9 2020-11-06 op 			if (errno == EINTR) {
722 d7802bb4 2020-12-02 op                                 warnx("connected clients: %d",
723 d7802bb4 2020-12-02 op 				    connected_clients);
724 120381c9 2020-11-06 op 				continue;
725 120381c9 2020-11-06 op 			}
726 d7802bb4 2020-12-02 op 			FATAL("poll: %s", strerror(errno));
727 120381c9 2020-11-06 op 		}
728 592fd624 2020-10-07 op 
729 592fd624 2020-10-07 op 		for (i = 0; i < MAX_USERS; i++) {
730 592fd624 2020-10-07 op 			assert(i < MAX_USERS);
731 592fd624 2020-10-07 op 
732 592fd624 2020-10-07 op 			if (fds[i].revents == 0)
733 592fd624 2020-10-07 op 				continue;
734 592fd624 2020-10-07 op 
735 592fd624 2020-10-07 op 			if (fds[i].revents & (POLLERR|POLLNVAL))
736 d7802bb4 2020-12-02 op 				FATAL("bad fd %d: %s", fds[i].fd,
737 d7802bb4 2020-12-02 op 				    strerror(errno));
738 592fd624 2020-10-07 op 
739 592fd624 2020-10-07 op 			if (fds[i].revents & POLLHUP) {
740 aff8d190 2020-11-06 op 				/* fds[i] may be the fd of the stdin
741 aff8d190 2020-11-06 op 				 * of a cgi script that has exited. */
742 aff8d190 2020-11-06 op 				if (!clients[i].waiting_on_child) {
743 aff8d190 2020-11-06 op 					goodbye(&fds[i], &clients[i]);
744 aff8d190 2020-11-06 op 					continue;
745 aff8d190 2020-11-06 op 				}
746 592fd624 2020-10-07 op 			}
747 592fd624 2020-10-07 op 
748 592fd624 2020-10-07 op 			todo--;
749 592fd624 2020-10-07 op 
750 592fd624 2020-10-07 op 			if (i == 0) { /* new client */
751 592fd624 2020-10-07 op 				do_accept(sock, ctx, fds, clients);
752 592fd624 2020-10-07 op 				continue;
753 592fd624 2020-10-07 op 			}
754 592fd624 2020-10-07 op 
755 592fd624 2020-10-07 op 			handle(&fds[i], &clients[i]);
756 592fd624 2020-10-07 op 		}
757 592fd624 2020-10-07 op 	}
758 231bfcdc 2020-12-21 op }
759 231bfcdc 2020-12-21 op 
760 231bfcdc 2020-12-21 op char *
761 231bfcdc 2020-12-21 op absolutify_path(const char *path)
762 231bfcdc 2020-12-21 op {
763 231bfcdc 2020-12-21 op 	char *wd, *r;
764 231bfcdc 2020-12-21 op 
765 231bfcdc 2020-12-21 op 	if (*path == '/')
766 231bfcdc 2020-12-21 op 		return strdup(path);
767 231bfcdc 2020-12-21 op 
768 231bfcdc 2020-12-21 op 	wd = getwd(NULL);
769 231bfcdc 2020-12-21 op 	if (asprintf(&r, "%s/%s", wd, path) == -1)
770 231bfcdc 2020-12-21 op 		err(1, "asprintf");
771 231bfcdc 2020-12-21 op 	free(wd);
772 231bfcdc 2020-12-21 op 	return r;
773 592fd624 2020-10-07 op }
774 592fd624 2020-10-07 op 
775 592fd624 2020-10-07 op void
776 3e4749f7 2020-10-02 op usage(const char *me)
777 3e4749f7 2020-10-02 op {
778 3e4749f7 2020-10-02 op 	fprintf(stderr,
779 72f653b6 2020-11-06 op 	    "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem] "
780 721e2325 2020-11-18 op 	    "[-l logfile] [-p port] [-x cgi-bin]\n",
781 3e4749f7 2020-10-02 op 	    me);
782 3e4749f7 2020-10-02 op }
783 3e4749f7 2020-10-02 op 
784 3e4749f7 2020-10-02 op int
785 3e4749f7 2020-10-02 op main(int argc, char **argv)
786 3e4749f7 2020-10-02 op {
787 72342dc9 2020-11-06 op 	const char *cert = "cert.pem", *key = "key.pem";
788 3e4749f7 2020-10-02 op 	struct tls *ctx = NULL;
789 3e4749f7 2020-10-02 op 	struct tls_config *conf;
790 3e4749f7 2020-10-02 op 	int sock, ch;
791 3e4749f7 2020-10-02 op 
792 0cf902af 2020-11-03 op 	signal(SIGPIPE, SIG_IGN);
793 72342dc9 2020-11-06 op 	signal(SIGCHLD, SIG_IGN);
794 0cf902af 2020-11-03 op 
795 120381c9 2020-11-06 op #ifdef SIGINFO
796 120381c9 2020-11-06 op 	signal(SIGINFO, siginfo_handler);
797 120381c9 2020-11-06 op #endif
798 120381c9 2020-11-06 op 	signal(SIGUSR2, siginfo_handler);
799 120381c9 2020-11-06 op 
800 120381c9 2020-11-06 op 	connected_clients = 0;
801 120381c9 2020-11-06 op 
802 51d876f0 2020-12-21 op 	if ((dir = absolutify_path("docs")) == NULL)
803 51d876f0 2020-12-21 op 		err(1, "absolutify_path");
804 51d876f0 2020-12-21 op 
805 72f653b6 2020-11-06 op 	cgi = NULL;
806 721e2325 2020-11-18 op 	port = 1965;
807 d7802bb4 2020-12-02 op 	foreground = 0;
808 2c3a40fa 2020-11-06 op 
809 d7802bb4 2020-12-02 op 	while ((ch = getopt(argc, argv, "c:d:fhk:p:x:")) != -1) {
810 3e4749f7 2020-10-02 op 		switch (ch) {
811 3e4749f7 2020-10-02 op 		case 'c':
812 3e4749f7 2020-10-02 op 			cert = optarg;
813 3e4749f7 2020-10-02 op 			break;
814 3e4749f7 2020-10-02 op 
815 3e4749f7 2020-10-02 op 		case 'd':
816 231bfcdc 2020-12-21 op 			free((char*)dir);
817 231bfcdc 2020-12-21 op 			if ((dir = absolutify_path(optarg)) == NULL)
818 231bfcdc 2020-12-21 op 				err(1, "absolutify_path");
819 3e4749f7 2020-10-02 op 			break;
820 3e4749f7 2020-10-02 op 
821 d7802bb4 2020-12-02 op 		case 'f':
822 d7802bb4 2020-12-02 op 			foreground = 1;
823 d7802bb4 2020-12-02 op 			break;
824 d7802bb4 2020-12-02 op 
825 3e4749f7 2020-10-02 op 		case 'h':
826 3e4749f7 2020-10-02 op 			usage(*argv);
827 3e4749f7 2020-10-02 op 			return 0;
828 3e4749f7 2020-10-02 op 
829 3e4749f7 2020-10-02 op 		case 'k':
830 3e4749f7 2020-10-02 op 			key = optarg;
831 3e4749f7 2020-10-02 op 			break;
832 3e4749f7 2020-10-02 op 
833 721e2325 2020-11-18 op 		case 'p': {
834 721e2325 2020-11-18 op 			char *ep;
835 721e2325 2020-11-18 op 			long lval;
836 721e2325 2020-11-18 op 
837 721e2325 2020-11-18 op 			errno = 0;
838 721e2325 2020-11-18 op 			lval = strtol(optarg, &ep, 10);
839 721e2325 2020-11-18 op 			if (optarg[0] == '\0' || *ep != '\0')
840 721e2325 2020-11-18 op 				err(1, "not a number: %s", optarg);
841 721e2325 2020-11-18 op 			if (lval < 0 || lval > UINT16_MAX)
842 721e2325 2020-11-18 op 				err(1, "port number out of range: %s", optarg);
843 721e2325 2020-11-18 op 			port = lval;
844 721e2325 2020-11-18 op 			break;
845 721e2325 2020-11-18 op 		}
846 721e2325 2020-11-18 op 
847 72342dc9 2020-11-06 op 		case 'x':
848 72f653b6 2020-11-06 op 			cgi = optarg;
849 72342dc9 2020-11-06 op 			break;
850 72342dc9 2020-11-06 op 
851 3e4749f7 2020-10-02 op 		default:
852 3e4749f7 2020-10-02 op 			usage(*argv);
853 3e4749f7 2020-10-02 op 			return 1;
854 3e4749f7 2020-10-02 op 		}
855 3e4749f7 2020-10-02 op 	}
856 3e4749f7 2020-10-02 op 
857 3e4749f7 2020-10-02 op 	if ((conf = tls_config_new()) == NULL)
858 3e4749f7 2020-10-02 op 		err(1, "tls_config_new");
859 0d8ca45a 2020-10-03 op 
860 677afbd3 2020-12-02 op 	/* optionally accept client certs, but don't try to verify them */
861 677afbd3 2020-12-02 op 	tls_config_verify_client_optional(conf);
862 677afbd3 2020-12-02 op 	tls_config_insecure_noverifycert(conf);
863 677afbd3 2020-12-02 op 
864 0d8ca45a 2020-10-03 op 	if (tls_config_set_protocols(conf,
865 0d8ca45a 2020-10-03 op 	    TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
866 0d8ca45a 2020-10-03 op 		err(1, "tls_config_set_protocols");
867 3e4749f7 2020-10-02 op 
868 4d4f0e19 2020-10-03 op 	if (tls_config_set_cert_file(conf, cert) == -1)
869 4d4f0e19 2020-10-03 op 		err(1, "tls_config_set_cert_file: %s", cert);
870 3e4749f7 2020-10-02 op 
871 4d4f0e19 2020-10-03 op 	if (tls_config_set_key_file(conf, key) == -1)
872 4d4f0e19 2020-10-03 op 		err(1, "tls_config_set_key_file: %s", key);
873 3e4749f7 2020-10-02 op 
874 3e4749f7 2020-10-02 op 	if ((ctx = tls_server()) == NULL)
875 3e4749f7 2020-10-02 op 		err(1, "tls_server");
876 3e4749f7 2020-10-02 op 
877 3e4749f7 2020-10-02 op 	if (tls_configure(ctx, conf) == -1)
878 3e4749f7 2020-10-02 op 		errx(1, "tls_configure: %s", tls_error(ctx));
879 3e4749f7 2020-10-02 op 
880 721e2325 2020-11-18 op 	sock = make_socket(port, AF_INET);
881 3e4749f7 2020-10-02 op 
882 3e4749f7 2020-10-02 op 	if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
883 3e4749f7 2020-10-02 op 		err(1, "open: %s", dir);
884 3e4749f7 2020-10-02 op 
885 d7802bb4 2020-12-02 op 	if (!foreground && daemon(0, 1) == -1)
886 d7802bb4 2020-12-02 op 		exit(1);
887 d7802bb4 2020-12-02 op 
888 72f653b6 2020-11-06 op 	if (cgi != NULL) {
889 72f653b6 2020-11-06 op 		if (unveil(dir, "rx") == -1)
890 72f653b6 2020-11-06 op 			err(1, "unveil");
891 72f653b6 2020-11-06 op 		if (pledge("stdio rpath inet proc exec", NULL) == -1)
892 72f653b6 2020-11-06 op 			err(1, "pledge");
893 72f653b6 2020-11-06 op 	} else {
894 72f653b6 2020-11-06 op 		if (unveil(dir, "r") == -1)
895 72f653b6 2020-11-06 op 			err(1, "unveil");
896 72f653b6 2020-11-06 op 		if (pledge("stdio rpath inet", NULL) == -1)
897 72f653b6 2020-11-06 op 			err(1, "pledge");
898 72f653b6 2020-11-06 op 	}
899 3e4749f7 2020-10-02 op 
900 3e4749f7 2020-10-02 op 	loop(ctx, sock);
901 3e4749f7 2020-10-02 op 
902 3e4749f7 2020-10-02 op 	close(sock);
903 3e4749f7 2020-10-02 op 	tls_free(ctx);
904 3e4749f7 2020-10-02 op 	tls_config_free(conf);
905 3e4749f7 2020-10-02 op }