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Date:: Sun Jan 10 14:40:14 2021 UTC
Message:: macro reordering and while there replace SAFE_SETENV with an inline function. LOG is more difficult to transform into an inline function, given the string concatenations it does. The other LOG* and FATAL macros are fine as they already are.
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  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 9b374f41 2021-01-10 op #define LOG(priority, c, fmt, ...)					\
 32 9b374f41 2021-01-10 op 	do {								\
 33 9b374f41 2021-01-10 op 		char buf[INET_ADDRSTRLEN];				\
 34 9b374f41 2021-01-10 op 		if (inet_ntop((c)->af, &(c)->addr,			\
 35 9b374f41 2021-01-10 op 		    buf, sizeof(buf)) == NULL)				\
 36 9b374f41 2021-01-10 op 			FATAL("inet_ntop: %s", strerror(errno));	\
 37 9b374f41 2021-01-10 op 		if (foreground)						\
 38 9b374f41 2021-01-10 op 			fprintf(stderr,					\
 39 9b374f41 2021-01-10 op 			    "%s " fmt "\n", buf, __VA_ARGS__);		\
 40 9b374f41 2021-01-10 op 		else							\
 41 9b374f41 2021-01-10 op 			syslog((priority) | LOG_DAEMON,			\
 42 9b374f41 2021-01-10 op 			    "%s " fmt, buf, __VA_ARGS__);		\
 43 9b374f41 2021-01-10 op 	} while (0)
 44 9b374f41 2021-01-10 op 
 45 9b374f41 2021-01-10 op #define LOGE(c, fmt, ...) LOG(LOG_ERR,    c, fmt, __VA_ARGS__)
 46 9b374f41 2021-01-10 op #define LOGN(c, fmt, ...) LOG(LOG_NOTICE, c, fmt, __VA_ARGS__)
 47 9b374f41 2021-01-10 op #define LOGI(c, fmt, ...) LOG(LOG_INFO,   c, fmt, __VA_ARGS__)
 48 9b374f41 2021-01-10 op #define LOGD(c, fmt, ...) LOG(LOG_DEBUG,  c, fmt, __VA_ARGS__)
 49 9b374f41 2021-01-10 op 
 50 9b374f41 2021-01-10 op #define FATAL(fmt, ...)							\
 51 9b374f41 2021-01-10 op 	do {								\
 52 9b374f41 2021-01-10 op 		if (foreground)						\
 53 9b374f41 2021-01-10 op 			fprintf(stderr, fmt "\n", __VA_ARGS__);		\
 54 9b374f41 2021-01-10 op 		else							\
 55 9b374f41 2021-01-10 op 			syslog(LOG_DAEMON | LOG_CRIT,			\
 56 9b374f41 2021-01-10 op 			    fmt, __VA_ARGS__);				\
 57 9b374f41 2021-01-10 op 		exit(1);						\
 58 9b374f41 2021-01-10 op 	} while (0)
 59 9b374f41 2021-01-10 op 
 60 d7802bb4 2020-12-02 op const char *dir, *cgi;
 61 d7802bb4 2020-12-02 op int dirfd;
 62 721e2325 2020-11-18 op int port;
 63 d7802bb4 2020-12-02 op int foreground;
 64 120381c9 2020-11-06 op int connected_clients;
 65 592fd624 2020-10-07 op 
 66 33d32d1f 2020-12-25 op struct etm {			/* file extension to mime */
 67 33d32d1f 2020-12-25 op 	const char	*mime;
 68 33d32d1f 2020-12-25 op 	const char	*ext;
 69 33d32d1f 2020-12-25 op } filetypes[] = {
 70 33d32d1f 2020-12-25 op 	{"application/pdf",	"pdf"},
 71 33d32d1f 2020-12-25 op 
 72 33d32d1f 2020-12-25 op 	{"image/gif",		"gif"},
 73 33d32d1f 2020-12-25 op 	{"image/jpeg",		"jpg"},
 74 33d32d1f 2020-12-25 op 	{"image/jpeg",		"jpeg"},
 75 33d32d1f 2020-12-25 op 	{"image/png",		"png"},
 76 33d32d1f 2020-12-25 op 	{"image/svg+xml",	"svg"},
 77 33d32d1f 2020-12-25 op 
 78 33d32d1f 2020-12-25 op 	{"text/gemini",		"gemini"},
 79 33d32d1f 2020-12-25 op 	{"text/gemini",		"gmi"},
 80 33d32d1f 2020-12-25 op 	{"text/markdown",	"markdown"},
 81 33d32d1f 2020-12-25 op 	{"text/markdown",	"md"},
 82 33d32d1f 2020-12-25 op 	{"text/plain",		"txt"},
 83 33d32d1f 2020-12-25 op 	{"text/xml",		"xml"},
 84 33d32d1f 2020-12-25 op 
 85 33d32d1f 2020-12-25 op 	{NULL, NULL}
 86 33d32d1f 2020-12-25 op };
 87 33d32d1f 2020-12-25 op 
 88 9b374f41 2021-01-10 op static inline void
 89 9b374f41 2021-01-10 op safe_setenv(const char *name, const char *val)
 90 9b374f41 2021-01-10 op {
 91 9b374f41 2021-01-10 op 	if (val == NULL)
 92 9b374f41 2021-01-10 op 		val = "";
 93 9b374f41 2021-01-10 op 	setenv(name, val, 1);
 94 9b374f41 2021-01-10 op }
 95 9b374f41 2021-01-10 op 
 96 120381c9 2020-11-06 op void
 97 4a28dd01 2020-12-28 op sig_handler(int sig)
 98 120381c9 2020-11-06 op {
 99 120381c9 2020-11-06 op 	(void)sig;
100 120381c9 2020-11-06 op }
101 120381c9 2020-11-06 op 
102 72f653b6 2020-11-06 op int
103 72f653b6 2020-11-06 op starts_with(const char *str, const char *prefix)
104 72f653b6 2020-11-06 op {
105 72f653b6 2020-11-06 op 	size_t i;
106 72f653b6 2020-11-06 op 
107 72f653b6 2020-11-06 op 	for (i = 0; prefix[i] != '\0'; ++i)
108 72f653b6 2020-11-06 op 		if (str[i] != prefix[i])
109 72f653b6 2020-11-06 op 			return 0;
110 72f653b6 2020-11-06 op 	return 1;
111 72f653b6 2020-11-06 op }
112 72f653b6 2020-11-06 op 
113 3e4749f7 2020-10-02 op int
114 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
115 3e4749f7 2020-10-02 op {
116 3e4749f7 2020-10-02 op 	char buf[1030] = {0}; 	/* status + ' ' + max reply len + \r\n\0 */
117 3e4749f7 2020-10-02 op 	int len;
118 592fd624 2020-10-07 op 	int ret;
119 3e4749f7 2020-10-02 op 
120 592fd624 2020-10-07 op 	client->code = code;
121 592fd624 2020-10-07 op 	client->meta = reason;
122 592fd624 2020-10-07 op 	client->state = S_INITIALIZING;
123 592fd624 2020-10-07 op 
124 3e4749f7 2020-10-02 op 	len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
125 3e4749f7 2020-10-02 op 	assert(len < (int)sizeof(buf));
126 592fd624 2020-10-07 op 	ret = tls_write(client->ctx, buf, len);
127 592fd624 2020-10-07 op 	if (ret == TLS_WANT_POLLIN) {
128 592fd624 2020-10-07 op 		pfd->events = POLLIN;
129 592fd624 2020-10-07 op 		return 0;
130 592fd624 2020-10-07 op 	}
131 592fd624 2020-10-07 op 
132 592fd624 2020-10-07 op 	if (ret == TLS_WANT_POLLOUT) {
133 592fd624 2020-10-07 op 		pfd->events = POLLOUT;
134 592fd624 2020-10-07 op 		return 0;
135 592fd624 2020-10-07 op 	}
136 592fd624 2020-10-07 op 
137 592fd624 2020-10-07 op 	return 1;
138 3e4749f7 2020-10-02 op }
139 3e4749f7 2020-10-02 op 
140 f28f9311 2020-10-14 op ssize_t
141 f28f9311 2020-10-14 op filesize(int fd)
142 f28f9311 2020-10-14 op {
143 f28f9311 2020-10-14 op 	ssize_t len;
144 f28f9311 2020-10-14 op 
145 f28f9311 2020-10-14 op 	if ((len = lseek(fd, 0, SEEK_END)) == -1)
146 f28f9311 2020-10-14 op 		return -1;
147 f28f9311 2020-10-14 op 	if (lseek(fd, 0, SEEK_SET) == -1)
148 f28f9311 2020-10-14 op 		return -1;
149 f28f9311 2020-10-14 op 	return len;
150 f28f9311 2020-10-14 op }
151 f28f9311 2020-10-14 op 
152 cc68fe70 2020-10-07 op const char *
153 cc68fe70 2020-10-07 op path_ext(const char *path)
154 cc68fe70 2020-10-07 op {
155 cc68fe70 2020-10-07 op 	const char *end;
156 cc68fe70 2020-10-07 op 
157 cc68fe70 2020-10-07 op 	end = path + strlen(path)-1; /* the last byte before the NUL */
158 cc68fe70 2020-10-07 op 	for (; end != path; --end) {
159 cc68fe70 2020-10-07 op 		if (*end == '.')
160 cc68fe70 2020-10-07 op 			return end+1;
161 cc68fe70 2020-10-07 op 		if (*end == '/')
162 cc68fe70 2020-10-07 op 			break;
163 cc68fe70 2020-10-07 op 	}
164 cc68fe70 2020-10-07 op 
165 cc68fe70 2020-10-07 op 	return NULL;
166 cc68fe70 2020-10-07 op }
167 cc68fe70 2020-10-07 op 
168 cc68fe70 2020-10-07 op const char *
169 cc68fe70 2020-10-07 op mime(const char *path)
170 cc68fe70 2020-10-07 op {
171 cc68fe70 2020-10-07 op 	const char *ext, *def = "application/octet-stream";
172 cc68fe70 2020-10-07 op 	struct etm *t;
173 cc68fe70 2020-10-07 op 
174 cc68fe70 2020-10-07 op 	if ((ext = path_ext(path)) == NULL)
175 cc68fe70 2020-10-07 op 		return def;
176 cc68fe70 2020-10-07 op 
177 cc68fe70 2020-10-07 op 	for (t = filetypes; t->mime != NULL; ++t)
178 cc68fe70 2020-10-07 op 		if (!strcmp(ext, t->ext))
179 cc68fe70 2020-10-07 op 			return t->mime;
180 cc68fe70 2020-10-07 op 
181 cc68fe70 2020-10-07 op 	return def;
182 3e4749f7 2020-10-02 op }
183 3e4749f7 2020-10-02 op 
184 f28f9311 2020-10-14 op int
185 d7802bb4 2020-12-02 op check_path(struct client *c, const char *path, int *fd)
186 3e4749f7 2020-10-02 op {
187 72342dc9 2020-11-06 op 	struct stat sb;
188 3e4749f7 2020-10-02 op 
189 f28f9311 2020-10-14 op 	assert(path != NULL);
190 33d32d1f 2020-12-25 op 	if ((*fd = openat(dirfd, *path ? path : ".",
191 a5d310bc 2020-11-10 op 		    O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
192 a5d310bc 2020-11-10 op 		return FILE_MISSING;
193 a5d310bc 2020-11-10 op 	}
194 a5d310bc 2020-11-10 op 
195 a5d310bc 2020-11-10 op 	if (fstat(*fd, &sb) == -1) {
196 d7802bb4 2020-12-02 op 		LOGN(c, "failed stat for %s: %s", path, strerror(errno));
197 a5d310bc 2020-11-10 op 		return FILE_MISSING;
198 a5d310bc 2020-11-10 op 	}
199 a5d310bc 2020-11-10 op 
200 a5d310bc 2020-11-10 op 	if (S_ISDIR(sb.st_mode))
201 a5d310bc 2020-11-10 op 		return FILE_DIRECTORY;
202 a5d310bc 2020-11-10 op 
203 a5d310bc 2020-11-10 op 	if (sb.st_mode & S_IXUSR)
204 a5d310bc 2020-11-10 op 		return FILE_EXECUTABLE;
205 a5d310bc 2020-11-10 op 
206 a5d310bc 2020-11-10 op 	return FILE_EXISTS;
207 a5d310bc 2020-11-10 op }
208 a5d310bc 2020-11-10 op 
209 a5d310bc 2020-11-10 op /*
210 a5d310bc 2020-11-10 op  * the inverse of this algorithm, i.e. starting from the start of the
211 a5d310bc 2020-11-10 op  * path + strlen(cgi), and checking if each component, should be
212 a5d310bc 2020-11-10 op  * faster.  But it's tedious to write.  This does the opposite: starts
213 a5d310bc 2020-11-10 op  * from the end and strip one component at a time, until either an
214 a5d310bc 2020-11-10 op  * executable is found or we emptied the path.
215 a5d310bc 2020-11-10 op  */
216 a5d310bc 2020-11-10 op int
217 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
218 a5d310bc 2020-11-10 op {
219 a5d310bc 2020-11-10 op 	char *end;
220 a5d310bc 2020-11-10 op 	end = strchr(path, '\0');
221 a5d310bc 2020-11-10 op 
222 a5d310bc 2020-11-10 op 	/* NB: assume CGI is enabled and path matches cgi */
223 a5d310bc 2020-11-10 op 
224 a5d310bc 2020-11-10 op 	while (end > path) {
225 a5d310bc 2020-11-10 op 		/* go up one level.  UNIX paths are simple and POSIX
226 a5d310bc 2020-11-10 op 		 * dirname, with its ambiguities on if the given path
227 a5d310bc 2020-11-10 op 		 * is changed or not, gives me headaches. */
228 a5d310bc 2020-11-10 op 		while (*end != '/')
229 a5d310bc 2020-11-10 op 			end--;
230 a5d310bc 2020-11-10 op 		*end = '\0';
231 3e4749f7 2020-10-02 op 
232 d7802bb4 2020-12-02 op 		switch (check_path(c, path, &c->fd)) {
233 a5d310bc 2020-11-10 op 		case FILE_EXECUTABLE:
234 a5d310bc 2020-11-10 op 			return start_cgi(path, end+1, query, fds,c);
235 a5d310bc 2020-11-10 op 		case FILE_MISSING:
236 a5d310bc 2020-11-10 op 			break;
237 a5d310bc 2020-11-10 op 		default:
238 a5d310bc 2020-11-10 op 			goto err;
239 a5d310bc 2020-11-10 op 		}
240 a5d310bc 2020-11-10 op 
241 a5d310bc 2020-11-10 op 		*end = '/';
242 a5d310bc 2020-11-10 op 		end--;
243 a5d310bc 2020-11-10 op 	}
244 a5d310bc 2020-11-10 op 
245 a5d310bc 2020-11-10 op err:
246 a5d310bc 2020-11-10 op 	if (!start_reply(fds, c, NOT_FOUND, "not found"))
247 a5d310bc 2020-11-10 op 		return 0;
248 a5d310bc 2020-11-10 op 	goodbye(fds, c);
249 a5d310bc 2020-11-10 op 	return 0;
250 a5d310bc 2020-11-10 op }
251 a5d310bc 2020-11-10 op 
252 a5d310bc 2020-11-10 op 
253 a5d310bc 2020-11-10 op int
254 33d32d1f 2020-12-25 op open_file(char *fpath, char *query, struct pollfd *fds, struct client *c)
255 a5d310bc 2020-11-10 op {
256 d7802bb4 2020-12-02 op 	switch (check_path(c, fpath, &c->fd)) {
257 a5d310bc 2020-11-10 op 	case FILE_EXECUTABLE:
258 5a40216f 2020-12-28 op 		if (cgi != NULL && starts_with(fpath, cgi))
259 a5d310bc 2020-11-10 op 			return start_cgi(fpath, "", query, fds, c);
260 3e4749f7 2020-10-02 op 
261 a5d310bc 2020-11-10 op 		/* fallthrough */
262 a5d310bc 2020-11-10 op 
263 a5d310bc 2020-11-10 op 	case FILE_EXISTS:
264 a5d310bc 2020-11-10 op 		if ((c->len = filesize(c->fd)) == -1) {
265 d7802bb4 2020-12-02 op 			LOGE(c, "failed to get file size for %s", fpath);
266 a5d310bc 2020-11-10 op 			goodbye(fds, c);
267 72342dc9 2020-11-06 op 			return 0;
268 a5d310bc 2020-11-10 op 		}
269 72342dc9 2020-11-06 op 
270 a5d310bc 2020-11-10 op 		if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
271 a5d310bc 2020-11-10 op 			    c->fd, 0)) == MAP_FAILED) {
272 a5d310bc 2020-11-10 op 			warn("mmap: %s", fpath);
273 a5d310bc 2020-11-10 op 			goodbye(fds, c);
274 a5d310bc 2020-11-10 op 			return 0;
275 a5d310bc 2020-11-10 op 		}
276 a5d310bc 2020-11-10 op 		c->i = c->buf;
277 a5d310bc 2020-11-10 op 		return start_reply(fds, c, SUCCESS, mime(fpath));
278 a5d310bc 2020-11-10 op 
279 a5d310bc 2020-11-10 op 	case FILE_DIRECTORY:
280 d7802bb4 2020-12-02 op 		LOGD(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
281 f28f9311 2020-10-14 op 		close(c->fd);
282 f28f9311 2020-10-14 op 		c->fd = -1;
283 f28f9311 2020-10-14 op 		send_dir(fpath, fds, c);
284 f28f9311 2020-10-14 op 		return 0;
285 3e4749f7 2020-10-02 op 
286 a5d310bc 2020-11-10 op 	case FILE_MISSING:
287 5a40216f 2020-12-28 op 		if (cgi != NULL && starts_with(fpath, cgi))
288 a5d310bc 2020-11-10 op 			return check_for_cgi(fpath, query, fds, c);
289 72342dc9 2020-11-06 op 
290 a5d310bc 2020-11-10 op 		if (!start_reply(fds, c, NOT_FOUND, "not found"))
291 a5d310bc 2020-11-10 op 			return 0;
292 f28f9311 2020-10-14 op 		goodbye(fds, c);
293 f28f9311 2020-10-14 op 		return 0;
294 f28f9311 2020-10-14 op 
295 a5d310bc 2020-11-10 op 	default:
296 a5d310bc 2020-11-10 op 		/* unreachable */
297 a5d310bc 2020-11-10 op 		abort();
298 592fd624 2020-10-07 op 	}
299 72342dc9 2020-11-06 op }
300 72342dc9 2020-11-06 op 
301 a5d310bc 2020-11-10 op int
302 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
303 75d233f0 2020-11-06 op     struct pollfd *fds, struct client *c)
304 72342dc9 2020-11-06 op {
305 72342dc9 2020-11-06 op 	pid_t pid;
306 a5d310bc 2020-11-10 op 	int p[2]; 		/* read end, write end */
307 72342dc9 2020-11-06 op 
308 72342dc9 2020-11-06 op 	if (pipe(p) == -1)
309 72342dc9 2020-11-06 op 		goto err;
310 72342dc9 2020-11-06 op 
311 72342dc9 2020-11-06 op 	switch (pid = fork()) {
312 72342dc9 2020-11-06 op 	case -1:
313 72342dc9 2020-11-06 op 		goto err;
314 72342dc9 2020-11-06 op 
315 a5d310bc 2020-11-10 op 	case 0: { 		/* child */
316 721e2325 2020-11-18 op 		char *ex, *requri, *portno;
317 72342dc9 2020-11-06 op 		char addr[INET_ADDRSTRLEN];
318 72342dc9 2020-11-06 op 		char *argv[] = { NULL, NULL, NULL };
319 72342dc9 2020-11-06 op 
320 a5d310bc 2020-11-10 op 		close(p[0]);
321 72342dc9 2020-11-06 op 		if (dup2(p[1], 1) == -1)
322 72342dc9 2020-11-06 op 			goto childerr;
323 72342dc9 2020-11-06 op 
324 72342dc9 2020-11-06 op 		if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
325 a5d310bc 2020-11-10 op 			goto childerr;
326 72342dc9 2020-11-06 op 
327 721e2325 2020-11-18 op 		if (asprintf(&portno, "%d", port) == -1)
328 721e2325 2020-11-18 op 			goto childerr;
329 721e2325 2020-11-18 op 
330 5a40216f 2020-12-28 op 		if (asprintf(&ex, "%s/%s", dir, spath) == -1)
331 72342dc9 2020-11-06 op 			goto childerr;
332 72342dc9 2020-11-06 op 
333 a5d310bc 2020-11-10 op 		if (asprintf(&requri, "%s%s%s", spath,
334 a5d310bc 2020-11-10 op 		    *relpath == '\0' ? "" : "/",
335 a5d310bc 2020-11-10 op 		    relpath) == -1)
336 a5d310bc 2020-11-10 op 			goto childerr;
337 a5d310bc 2020-11-10 op 
338 a5d310bc 2020-11-10 op 		argv[0] = argv[1] = ex;
339 a5d310bc 2020-11-10 op 
340 60ba426e 2020-11-06 op 		/* fix the env */
341 9b374f41 2021-01-10 op 		safe_setenv("GATEWAY_INTERFACE", "CGI/1.1");
342 9b374f41 2021-01-10 op 		safe_setenv("SERVER_SOFTWARE", "gmid");
343 9b374f41 2021-01-10 op 		safe_setenv("SERVER_PORT", portno);
344 a5d310bc 2020-11-10 op 		/* setenv("SERVER_NAME", "", 1); */
345 9b374f41 2021-01-10 op 		safe_setenv("SCRIPT_NAME", spath);
346 9b374f41 2021-01-10 op 		safe_setenv("SCRIPT_EXECUTABLE", ex);
347 9b374f41 2021-01-10 op 		safe_setenv("REQUEST_URI", requri);
348 9b374f41 2021-01-10 op 		safe_setenv("REQUEST_RELATIVE", relpath);
349 9b374f41 2021-01-10 op 		safe_setenv("QUERY_STRING", query);
350 9b374f41 2021-01-10 op 		safe_setenv("REMOTE_HOST", addr);
351 9b374f41 2021-01-10 op 		safe_setenv("REMOTE_ADDR", addr);
352 9b374f41 2021-01-10 op 		safe_setenv("DOCUMENT_ROOT", dir);
353 72342dc9 2020-11-06 op 
354 677afbd3 2020-12-02 op 		if (tls_peer_cert_provided(c->ctx)) {
355 9b374f41 2021-01-10 op 			safe_setenv("AUTH_TYPE", "Certificate");
356 9b374f41 2021-01-10 op 			safe_setenv("REMOTE_USER", tls_peer_cert_subject(c->ctx));
357 9b374f41 2021-01-10 op 			safe_setenv("TLS_CLIENT_ISSUER", tls_peer_cert_issuer(c->ctx));
358 9b374f41 2021-01-10 op 			safe_setenv("TLS_CLIENT_HASH", tls_peer_cert_hash(c->ctx));
359 677afbd3 2020-12-02 op 		}
360 677afbd3 2020-12-02 op 
361 a5d310bc 2020-11-10 op 		execvp(ex, argv);
362 72342dc9 2020-11-06 op 		goto childerr;
363 72342dc9 2020-11-06 op 	}
364 72342dc9 2020-11-06 op 
365 72342dc9 2020-11-06 op 	default:		/* parent */
366 a5d310bc 2020-11-10 op 		close(p[1]);
367 72342dc9 2020-11-06 op 		close(c->fd);
368 72342dc9 2020-11-06 op 		c->fd = p[0];
369 72342dc9 2020-11-06 op 		c->child = pid;
370 aff8d190 2020-11-06 op 		mark_nonblock(c->fd);
371 aff8d190 2020-11-06 op 		c->state = S_SENDING;
372 72342dc9 2020-11-06 op 		handle_cgi(fds, c);
373 a5d310bc 2020-11-10 op 		return 0;
374 72342dc9 2020-11-06 op 	}
375 72342dc9 2020-11-06 op 
376 72342dc9 2020-11-06 op err:
377 72342dc9 2020-11-06 op 	if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
378 a5d310bc 2020-11-10 op 		return 0;
379 72342dc9 2020-11-06 op 	goodbye(fds, c);
380 a5d310bc 2020-11-10 op 	return 0;
381 72342dc9 2020-11-06 op 
382 72342dc9 2020-11-06 op childerr:
383 72342dc9 2020-11-06 op 	dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
384 72342dc9 2020-11-06 op 	close(p[1]);
385 a5d310bc 2020-11-10 op 	_exit(1);
386 72342dc9 2020-11-06 op }
387 72342dc9 2020-11-06 op 
388 72342dc9 2020-11-06 op void
389 6c6c7a0e 2020-12-28 op cgi_poll_on_child(struct pollfd *fds, struct client *c)
390 72342dc9 2020-11-06 op {
391 aff8d190 2020-11-06 op 	int fd;
392 72342dc9 2020-11-06 op 
393 aff8d190 2020-11-06 op 	if (c->waiting_on_child)
394 aff8d190 2020-11-06 op 		return;
395 aff8d190 2020-11-06 op 	c->waiting_on_child = 1;
396 aff8d190 2020-11-06 op 
397 aff8d190 2020-11-06 op 	fds->events = POLLIN;
398 aff8d190 2020-11-06 op 
399 aff8d190 2020-11-06 op 	fd = fds->fd;
400 aff8d190 2020-11-06 op 	fds->fd = c->fd;
401 aff8d190 2020-11-06 op 	c->fd = fd;
402 aff8d190 2020-11-06 op }
403 aff8d190 2020-11-06 op 
404 aff8d190 2020-11-06 op void
405 6c6c7a0e 2020-12-28 op cgi_poll_on_client(struct pollfd *fds, struct client *c)
406 aff8d190 2020-11-06 op {
407 aff8d190 2020-11-06 op 	int fd;
408 aff8d190 2020-11-06 op 
409 aff8d190 2020-11-06 op 	if (!c->waiting_on_child)
410 aff8d190 2020-11-06 op 		return;
411 aff8d190 2020-11-06 op 	c->waiting_on_child = 0;
412 aff8d190 2020-11-06 op 
413 aff8d190 2020-11-06 op 	fd = fds->fd;
414 aff8d190 2020-11-06 op 	fds->fd = c->fd;
415 aff8d190 2020-11-06 op 	c->fd = fd;
416 aff8d190 2020-11-06 op }
417 aff8d190 2020-11-06 op 
418 aff8d190 2020-11-06 op void
419 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
420 aff8d190 2020-11-06 op {
421 aff8d190 2020-11-06 op 	ssize_t r;
422 aff8d190 2020-11-06 op 
423 aff8d190 2020-11-06 op 	/* ensure c->fd is the child and fds->fd the client */
424 6c6c7a0e 2020-12-28 op 	cgi_poll_on_client(fds, c);
425 aff8d190 2020-11-06 op 
426 72342dc9 2020-11-06 op 	while (1) {
427 aff8d190 2020-11-06 op 		if (c->len == 0) {
428 aff8d190 2020-11-06 op 			if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
429 aff8d190 2020-11-06 op 				goto end;
430 aff8d190 2020-11-06 op 			if (r == -1) {
431 aff8d190 2020-11-06 op 				if (errno == EAGAIN || errno == EWOULDBLOCK) {
432 6c6c7a0e 2020-12-28 op 					cgi_poll_on_child(fds, c);
433 aff8d190 2020-11-06 op 					return;
434 aff8d190 2020-11-06 op 				}
435 aff8d190 2020-11-06 op                                 goto end;
436 aff8d190 2020-11-06 op 			}
437 aff8d190 2020-11-06 op 			c->len = r;
438 aff8d190 2020-11-06 op 			c->off = 0;
439 aff8d190 2020-11-06 op 		}
440 aff8d190 2020-11-06 op 
441 aff8d190 2020-11-06 op 		while (c->len > 0) {
442 aff8d190 2020-11-06 op 			switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
443 72342dc9 2020-11-06 op 			case -1:
444 72342dc9 2020-11-06 op 				goto end;
445 72342dc9 2020-11-06 op 
446 72342dc9 2020-11-06 op 			case TLS_WANT_POLLOUT:
447 aff8d190 2020-11-06 op 				fds->events = POLLOUT;
448 aff8d190 2020-11-06 op 				return;
449 aff8d190 2020-11-06 op 
450 72342dc9 2020-11-06 op 			case TLS_WANT_POLLIN:
451 aff8d190 2020-11-06 op 				fds->events = POLLIN;
452 aff8d190 2020-11-06 op 				return;
453 72342dc9 2020-11-06 op 
454 72342dc9 2020-11-06 op 			default:
455 aff8d190 2020-11-06 op                                 c->off += r;
456 aff8d190 2020-11-06 op 				c->len -= r;
457 aff8d190 2020-11-06 op 				break;
458 72342dc9 2020-11-06 op 			}
459 72342dc9 2020-11-06 op 		}
460 72342dc9 2020-11-06 op 	}
461 72342dc9 2020-11-06 op 
462 72342dc9 2020-11-06 op end:
463 72342dc9 2020-11-06 op 	goodbye(fds, c);
464 f28f9311 2020-10-14 op }
465 592fd624 2020-10-07 op 
466 f28f9311 2020-10-14 op void
467 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
468 f28f9311 2020-10-14 op {
469 f28f9311 2020-10-14 op 	ssize_t ret, len;
470 592fd624 2020-10-07 op 
471 f28f9311 2020-10-14 op 	if (c->fd == -1) {
472 75d233f0 2020-11-06 op 		if (!open_file(path, query, fds, c))
473 f28f9311 2020-10-14 op 			return;
474 f28f9311 2020-10-14 op 		c->state = S_SENDING;
475 f28f9311 2020-10-14 op 	}
476 592fd624 2020-10-07 op 
477 f28f9311 2020-10-14 op 	len = (c->buf + c->len) - c->i;
478 f28f9311 2020-10-14 op 
479 f28f9311 2020-10-14 op 	while (len > 0) {
480 f28f9311 2020-10-14 op 		switch (ret = tls_write(c->ctx, c->i, len)) {
481 f28f9311 2020-10-14 op 		case -1:
482 d7802bb4 2020-12-02 op 			LOGE(c, "tls_write: %s", tls_error(c->ctx));
483 f28f9311 2020-10-14 op 			goodbye(fds, c);
484 f28f9311 2020-10-14 op 			return;
485 f28f9311 2020-10-14 op 
486 f28f9311 2020-10-14 op 		case TLS_WANT_POLLIN:
487 f28f9311 2020-10-14 op 			fds->events = POLLIN;
488 f28f9311 2020-10-14 op 			return;
489 f28f9311 2020-10-14 op 
490 f28f9311 2020-10-14 op 		case TLS_WANT_POLLOUT:
491 f28f9311 2020-10-14 op 			fds->events = POLLOUT;
492 f28f9311 2020-10-14 op 			return;
493 f28f9311 2020-10-14 op 
494 f28f9311 2020-10-14 op 		default:
495 f28f9311 2020-10-14 op 			c->i += ret;
496 f28f9311 2020-10-14 op 			len -= ret;
497 f28f9311 2020-10-14 op 			break;
498 3e4749f7 2020-10-02 op 		}
499 3e4749f7 2020-10-02 op 	}
500 f28f9311 2020-10-14 op 
501 f28f9311 2020-10-14 op 	goodbye(fds, c);
502 3e4749f7 2020-10-02 op }
503 3e4749f7 2020-10-02 op 
504 3e4749f7 2020-10-02 op void
505 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
506 3e4749f7 2020-10-02 op {
507 3e4749f7 2020-10-02 op 	char fpath[PATHBUF];
508 3e4749f7 2020-10-02 op 	size_t len;
509 3e4749f7 2020-10-02 op 
510 3e4749f7 2020-10-02 op 	bzero(fpath, PATHBUF);
511 3e4749f7 2020-10-02 op 
512 9c56b0a7 2020-10-14 op 	if (path[0] != '.')
513 3e4749f7 2020-10-02 op 		fpath[0] = '.';
514 3e4749f7 2020-10-02 op 
515 3e4749f7 2020-10-02 op 	/* this cannot fail since sizeof(fpath) > maxlen of path */
516 3e4749f7 2020-10-02 op 	strlcat(fpath, path, PATHBUF);
517 3e4749f7 2020-10-02 op 	len = strlen(fpath);
518 3e4749f7 2020-10-02 op 
519 3e4749f7 2020-10-02 op 	/* add a trailing / in case. */
520 3e4749f7 2020-10-02 op 	if (fpath[len-1] != '/') {
521 3e4749f7 2020-10-02 op 		fpath[len] = '/';
522 3e4749f7 2020-10-02 op 	}
523 3e4749f7 2020-10-02 op 
524 3e4749f7 2020-10-02 op 	strlcat(fpath, "index.gmi", sizeof(fpath));
525 3e4749f7 2020-10-02 op 
526 75d233f0 2020-11-06 op 	send_file(fpath, NULL, fds, client);
527 3e4749f7 2020-10-02 op }
528 3e4749f7 2020-10-02 op 
529 3e4749f7 2020-10-02 op void
530 592fd624 2020-10-07 op handle(struct pollfd *fds, struct client *client)
531 3e4749f7 2020-10-02 op {
532 592fd624 2020-10-07 op 	char buf[GEMINI_URL_LEN];
533 33d32d1f 2020-12-25 op 	const char *parse_err;
534 33d32d1f 2020-12-25 op 	struct uri uri;
535 3e4749f7 2020-10-02 op 
536 592fd624 2020-10-07 op 	switch (client->state) {
537 592fd624 2020-10-07 op 	case S_OPEN:
538 592fd624 2020-10-07 op 		bzero(buf, GEMINI_URL_LEN);
539 592fd624 2020-10-07 op 		switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
540 592fd624 2020-10-07 op 		case -1:
541 d7802bb4 2020-12-02 op 			LOGE(client, "tls_read: %s", tls_error(client->ctx));
542 592fd624 2020-10-07 op 			goodbye(fds, client);
543 592fd624 2020-10-07 op 			return;
544 3e4749f7 2020-10-02 op 
545 592fd624 2020-10-07 op 		case TLS_WANT_POLLIN:
546 592fd624 2020-10-07 op 			fds->events = POLLIN;
547 592fd624 2020-10-07 op 			return;
548 3e4749f7 2020-10-02 op 
549 592fd624 2020-10-07 op 		case TLS_WANT_POLLOUT:
550 592fd624 2020-10-07 op 			fds->events = POLLOUT;
551 592fd624 2020-10-07 op 			return;
552 592fd624 2020-10-07 op 		}
553 3e4749f7 2020-10-02 op 
554 b3deee7b 2020-12-28 op 		parse_err = "invalid request";
555 33d32d1f 2020-12-25 op 		if (!trim_req_uri(buf) || !parse_uri(buf, &uri, &parse_err)) {
556 33d32d1f 2020-12-25 op 			if (!start_reply(fds, client, BAD_REQUEST, parse_err))
557 592fd624 2020-10-07 op 				return;
558 592fd624 2020-10-07 op 			goodbye(fds, client);
559 592fd624 2020-10-07 op 			return;
560 592fd624 2020-10-07 op 		}
561 592fd624 2020-10-07 op 
562 33d32d1f 2020-12-25 op 		LOGI(client, "GET %s%s%s",
563 33d32d1f 2020-12-25 op 		    *uri.path ? uri.path : "/",
564 33d32d1f 2020-12-25 op 		    *uri.query ? "?" : "",
565 33d32d1f 2020-12-25 op 		    *uri.query ? uri.query : "");
566 592fd624 2020-10-07 op 
567 33d32d1f 2020-12-25 op 		send_file(uri.path, uri.query, fds, client);
568 592fd624 2020-10-07 op 		break;
569 592fd624 2020-10-07 op 
570 592fd624 2020-10-07 op 	case S_INITIALIZING:
571 592fd624 2020-10-07 op 		if (!start_reply(fds, client, client->code, client->meta))
572 592fd624 2020-10-07 op 			return;
573 592fd624 2020-10-07 op 
574 592fd624 2020-10-07 op 		if (client->code != SUCCESS) {
575 592fd624 2020-10-07 op 			/* we don't need a body */
576 592fd624 2020-10-07 op 			goodbye(fds, client);
577 592fd624 2020-10-07 op 			return;
578 592fd624 2020-10-07 op 		}
579 592fd624 2020-10-07 op 
580 592fd624 2020-10-07 op 		client->state = S_SENDING;
581 592fd624 2020-10-07 op 
582 592fd624 2020-10-07 op 		/* fallthrough */
583 592fd624 2020-10-07 op 
584 592fd624 2020-10-07 op 	case S_SENDING:
585 aff8d190 2020-11-06 op 		if (client->child != -1)
586 aff8d190 2020-11-06 op 			handle_cgi(fds, client);
587 aff8d190 2020-11-06 op 		else
588 aff8d190 2020-11-06 op 			send_file(NULL, NULL, fds, client);
589 592fd624 2020-10-07 op 		break;
590 592fd624 2020-10-07 op 
591 592fd624 2020-10-07 op 	case S_CLOSING:
592 592fd624 2020-10-07 op 		goodbye(fds, client);
593 592fd624 2020-10-07 op 		break;
594 592fd624 2020-10-07 op 
595 592fd624 2020-10-07 op 	default:
596 592fd624 2020-10-07 op 		/* unreachable */
597 592fd624 2020-10-07 op 		abort();
598 592fd624 2020-10-07 op 	}
599 3e4749f7 2020-10-02 op }
600 3e4749f7 2020-10-02 op 
601 592fd624 2020-10-07 op void
602 592fd624 2020-10-07 op mark_nonblock(int fd)
603 592fd624 2020-10-07 op {
604 592fd624 2020-10-07 op 	int flags;
605 592fd624 2020-10-07 op 
606 592fd624 2020-10-07 op 	if ((flags = fcntl(fd, F_GETFL)) == -1)
607 d7802bb4 2020-12-02 op 		FATAL("fcntl(F_GETFL): %s", strerror(errno));
608 592fd624 2020-10-07 op 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
609 d7802bb4 2020-12-02 op 		FATAL("fcntl(F_SETFL): %s", strerror(errno));
610 592fd624 2020-10-07 op }
611 592fd624 2020-10-07 op 
612 3e4749f7 2020-10-02 op int
613 9468027b 2020-10-15 op make_socket(int port, int family)
614 3e4749f7 2020-10-02 op {
615 3e4749f7 2020-10-02 op 	int sock, v;
616 9468027b 2020-10-15 op 	struct sockaddr_in addr4;
617 9468027b 2020-10-15 op 	struct sockaddr_in6 addr6;
618 9468027b 2020-10-15 op 	struct sockaddr *addr;
619 9468027b 2020-10-15 op 	socklen_t len;
620 3e4749f7 2020-10-02 op 
621 9468027b 2020-10-15 op         switch (family) {
622 9468027b 2020-10-15 op 	case AF_INET:
623 9468027b 2020-10-15 op 		bzero(&addr4, sizeof(addr4));
624 9468027b 2020-10-15 op 		addr4.sin_family = family;
625 9468027b 2020-10-15 op 		addr4.sin_port = htons(port);
626 9468027b 2020-10-15 op 		addr4.sin_addr.s_addr = INADDR_ANY;
627 9468027b 2020-10-15 op 		addr = (struct sockaddr*)&addr4;
628 9468027b 2020-10-15 op 		len = sizeof(addr4);
629 9468027b 2020-10-15 op 		break;
630 9468027b 2020-10-15 op 
631 9468027b 2020-10-15 op 	case AF_INET6:
632 9468027b 2020-10-15 op 		bzero(&addr6, sizeof(addr6));
633 9468027b 2020-10-15 op 		addr6.sin6_family = AF_INET6;
634 9468027b 2020-10-15 op 		addr6.sin6_port = htons(port);
635 9468027b 2020-10-15 op 		addr6.sin6_addr = in6addr_any;
636 9468027b 2020-10-15 op 		addr = (struct sockaddr*)&addr6;
637 9468027b 2020-10-15 op 		len = sizeof(addr6);
638 9468027b 2020-10-15 op 		break;
639 9468027b 2020-10-15 op 
640 9468027b 2020-10-15 op 	default:
641 9468027b 2020-10-15 op 		/* unreachable */
642 9468027b 2020-10-15 op 		abort();
643 9468027b 2020-10-15 op 	}
644 9468027b 2020-10-15 op 
645 9468027b 2020-10-15 op 	if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
646 d7802bb4 2020-12-02 op 		FATAL("socket: %s", strerror(errno));
647 3e4749f7 2020-10-02 op 
648 3e4749f7 2020-10-02 op 	v = 1;
649 3e4749f7 2020-10-02 op 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
650 d7802bb4 2020-12-02 op 		FATAL("setsockopt(SO_REUSEADDR): %s", strerror(errno));
651 3e4749f7 2020-10-02 op 
652 3e4749f7 2020-10-02 op 	v = 1;
653 3e4749f7 2020-10-02 op 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
654 d7802bb4 2020-12-02 op 		FATAL("setsockopt(SO_REUSEPORT): %s", strerror(errno));
655 3e4749f7 2020-10-02 op 
656 592fd624 2020-10-07 op 	mark_nonblock(sock);
657 592fd624 2020-10-07 op 
658 9468027b 2020-10-15 op 	if (bind(sock, addr, len) == -1)
659 d7802bb4 2020-12-02 op 		FATAL("bind: %s", strerror(errno));
660 3e4749f7 2020-10-02 op 
661 3e4749f7 2020-10-02 op 	if (listen(sock, 16) == -1)
662 d7802bb4 2020-12-02 op 		FATAL("listen: %s", strerror(errno));
663 3e4749f7 2020-10-02 op 
664 3e4749f7 2020-10-02 op 	return sock;
665 3e4749f7 2020-10-02 op }
666 3e4749f7 2020-10-02 op 
667 3e4749f7 2020-10-02 op void
668 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
669 3e4749f7 2020-10-02 op {
670 592fd624 2020-10-07 op 	int i, fd;
671 592fd624 2020-10-07 op 	struct sockaddr_in addr;
672 3e4749f7 2020-10-02 op 	socklen_t len;
673 3e4749f7 2020-10-02 op 
674 592fd624 2020-10-07 op 	len = sizeof(addr);
675 592fd624 2020-10-07 op 	if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
676 592fd624 2020-10-07 op 		if (errno == EWOULDBLOCK)
677 592fd624 2020-10-07 op 			return;
678 d7802bb4 2020-12-02 op 		FATAL("accept: %s", strerror(errno));
679 592fd624 2020-10-07 op 	}
680 3e4749f7 2020-10-02 op 
681 592fd624 2020-10-07 op 	mark_nonblock(fd);
682 3e4749f7 2020-10-02 op 
683 592fd624 2020-10-07 op 	for (i = 0; i < MAX_USERS; ++i) {
684 592fd624 2020-10-07 op 		if (fds[i].fd == -1) {
685 592fd624 2020-10-07 op 			bzero(&clients[i], sizeof(struct client));
686 592fd624 2020-10-07 op 			if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
687 592fd624 2020-10-07 op 				break; /* goodbye fd! */
688 592fd624 2020-10-07 op 
689 592fd624 2020-10-07 op 			fds[i].fd = fd;
690 592fd624 2020-10-07 op 			fds[i].events = POLLIN;
691 592fd624 2020-10-07 op 
692 592fd624 2020-10-07 op 			clients[i].state = S_OPEN;
693 592fd624 2020-10-07 op 			clients[i].fd = -1;
694 72342dc9 2020-11-06 op 			clients[i].child = -1;
695 f28f9311 2020-10-14 op 			clients[i].buf = MAP_FAILED;
696 2c3a40fa 2020-11-06 op 			clients[i].af = AF_INET;
697 2c3a40fa 2020-11-06 op 			clients[i].addr = addr.sin_addr;
698 592fd624 2020-10-07 op 
699 120381c9 2020-11-06 op 			connected_clients++;
700 592fd624 2020-10-07 op 			return;
701 3e4749f7 2020-10-02 op 		}
702 592fd624 2020-10-07 op 	}
703 3e4749f7 2020-10-02 op 
704 592fd624 2020-10-07 op 	close(fd);
705 592fd624 2020-10-07 op }
706 3e4749f7 2020-10-02 op 
707 592fd624 2020-10-07 op void
708 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
709 592fd624 2020-10-07 op {
710 592fd624 2020-10-07 op 	ssize_t ret;
711 592fd624 2020-10-07 op 
712 592fd624 2020-10-07 op 	c->state = S_CLOSING;
713 592fd624 2020-10-07 op 
714 592fd624 2020-10-07 op 	ret = tls_close(c->ctx);
715 592fd624 2020-10-07 op 	if (ret == TLS_WANT_POLLIN) {
716 592fd624 2020-10-07 op 		pfd->events = POLLIN;
717 592fd624 2020-10-07 op 		return;
718 3e4749f7 2020-10-02 op 	}
719 592fd624 2020-10-07 op 	if (ret == TLS_WANT_POLLOUT) {
720 592fd624 2020-10-07 op 		pfd->events = POLLOUT;
721 592fd624 2020-10-07 op 		return;
722 592fd624 2020-10-07 op 	}
723 592fd624 2020-10-07 op 
724 120381c9 2020-11-06 op 	connected_clients--;
725 120381c9 2020-11-06 op 
726 592fd624 2020-10-07 op 	tls_free(c->ctx);
727 592fd624 2020-10-07 op 	c->ctx = NULL;
728 592fd624 2020-10-07 op 
729 f28f9311 2020-10-14 op 	if (c->buf != MAP_FAILED)
730 f28f9311 2020-10-14 op 		munmap(c->buf, c->len);
731 f28f9311 2020-10-14 op 
732 592fd624 2020-10-07 op 	if (c->fd != -1)
733 592fd624 2020-10-07 op 		close(c->fd);
734 592fd624 2020-10-07 op 
735 592fd624 2020-10-07 op 	close(pfd->fd);
736 592fd624 2020-10-07 op 	pfd->fd = -1;
737 3e4749f7 2020-10-02 op }
738 3e4749f7 2020-10-02 op 
739 3e4749f7 2020-10-02 op void
740 592fd624 2020-10-07 op loop(struct tls *ctx, int sock)
741 592fd624 2020-10-07 op {
742 16ace04d 2021-01-08 op 	int i;
743 592fd624 2020-10-07 op 	struct client clients[MAX_USERS];
744 592fd624 2020-10-07 op 	struct pollfd fds[MAX_USERS];
745 592fd624 2020-10-07 op 
746 592fd624 2020-10-07 op 	for (i = 0; i < MAX_USERS; ++i) {
747 592fd624 2020-10-07 op 		fds[i].fd = -1;
748 592fd624 2020-10-07 op 		fds[i].events = POLLIN;
749 592fd624 2020-10-07 op 		bzero(&clients[i], sizeof(struct client));
750 592fd624 2020-10-07 op 	}
751 592fd624 2020-10-07 op 
752 592fd624 2020-10-07 op 	fds[0].fd = sock;
753 592fd624 2020-10-07 op 
754 592fd624 2020-10-07 op 	for (;;) {
755 16ace04d 2021-01-08 op 		if (poll(fds, MAX_USERS, INFTIM) == -1) {
756 120381c9 2020-11-06 op 			if (errno == EINTR) {
757 d7802bb4 2020-12-02 op                                 warnx("connected clients: %d",
758 d7802bb4 2020-12-02 op 				    connected_clients);
759 120381c9 2020-11-06 op 				continue;
760 120381c9 2020-11-06 op 			}
761 d7802bb4 2020-12-02 op 			FATAL("poll: %s", strerror(errno));
762 120381c9 2020-11-06 op 		}
763 592fd624 2020-10-07 op 
764 592fd624 2020-10-07 op 		for (i = 0; i < MAX_USERS; i++) {
765 592fd624 2020-10-07 op 			if (fds[i].revents == 0)
766 592fd624 2020-10-07 op 				continue;
767 592fd624 2020-10-07 op 
768 592fd624 2020-10-07 op 			if (fds[i].revents & (POLLERR|POLLNVAL))
769 d7802bb4 2020-12-02 op 				FATAL("bad fd %d: %s", fds[i].fd,
770 d7802bb4 2020-12-02 op 				    strerror(errno));
771 592fd624 2020-10-07 op 
772 592fd624 2020-10-07 op 			if (fds[i].revents & POLLHUP) {
773 aff8d190 2020-11-06 op 				/* fds[i] may be the fd of the stdin
774 aff8d190 2020-11-06 op 				 * of a cgi script that has exited. */
775 aff8d190 2020-11-06 op 				if (!clients[i].waiting_on_child) {
776 aff8d190 2020-11-06 op 					goodbye(&fds[i], &clients[i]);
777 aff8d190 2020-11-06 op 					continue;
778 aff8d190 2020-11-06 op 				}
779 592fd624 2020-10-07 op 			}
780 592fd624 2020-10-07 op 
781 592fd624 2020-10-07 op 			if (i == 0) { /* new client */
782 592fd624 2020-10-07 op 				do_accept(sock, ctx, fds, clients);
783 592fd624 2020-10-07 op 				continue;
784 592fd624 2020-10-07 op 			}
785 592fd624 2020-10-07 op 
786 592fd624 2020-10-07 op 			handle(&fds[i], &clients[i]);
787 592fd624 2020-10-07 op 		}
788 592fd624 2020-10-07 op 	}
789 231bfcdc 2020-12-21 op }
790 231bfcdc 2020-12-21 op 
791 231bfcdc 2020-12-21 op char *
792 231bfcdc 2020-12-21 op absolutify_path(const char *path)
793 231bfcdc 2020-12-21 op {
794 231bfcdc 2020-12-21 op 	char *wd, *r;
795 231bfcdc 2020-12-21 op 
796 231bfcdc 2020-12-21 op 	if (*path == '/')
797 231bfcdc 2020-12-21 op 		return strdup(path);
798 231bfcdc 2020-12-21 op 
799 231bfcdc 2020-12-21 op 	wd = getwd(NULL);
800 231bfcdc 2020-12-21 op 	if (asprintf(&r, "%s/%s", wd, path) == -1)
801 231bfcdc 2020-12-21 op 		err(1, "asprintf");
802 231bfcdc 2020-12-21 op 	free(wd);
803 231bfcdc 2020-12-21 op 	return r;
804 592fd624 2020-10-07 op }
805 592fd624 2020-10-07 op 
806 592fd624 2020-10-07 op void
807 3e4749f7 2020-10-02 op usage(const char *me)
808 3e4749f7 2020-10-02 op {
809 3e4749f7 2020-10-02 op 	fprintf(stderr,
810 72f653b6 2020-11-06 op 	    "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem] "
811 721e2325 2020-11-18 op 	    "[-l logfile] [-p port] [-x cgi-bin]\n",
812 3e4749f7 2020-10-02 op 	    me);
813 3e4749f7 2020-10-02 op }
814 3e4749f7 2020-10-02 op 
815 3e4749f7 2020-10-02 op int
816 3e4749f7 2020-10-02 op main(int argc, char **argv)
817 3e4749f7 2020-10-02 op {
818 72342dc9 2020-11-06 op 	const char *cert = "cert.pem", *key = "key.pem";
819 3e4749f7 2020-10-02 op 	struct tls *ctx = NULL;
820 3e4749f7 2020-10-02 op 	struct tls_config *conf;
821 3e4749f7 2020-10-02 op 	int sock, ch;
822 120381c9 2020-11-06 op 	connected_clients = 0;
823 120381c9 2020-11-06 op 
824 51d876f0 2020-12-21 op 	if ((dir = absolutify_path("docs")) == NULL)
825 51d876f0 2020-12-21 op 		err(1, "absolutify_path");
826 51d876f0 2020-12-21 op 
827 72f653b6 2020-11-06 op 	cgi = NULL;
828 721e2325 2020-11-18 op 	port = 1965;
829 d7802bb4 2020-12-02 op 	foreground = 0;
830 2c3a40fa 2020-11-06 op 
831 d7802bb4 2020-12-02 op 	while ((ch = getopt(argc, argv, "c:d:fhk:p:x:")) != -1) {
832 3e4749f7 2020-10-02 op 		switch (ch) {
833 3e4749f7 2020-10-02 op 		case 'c':
834 3e4749f7 2020-10-02 op 			cert = optarg;
835 3e4749f7 2020-10-02 op 			break;
836 3e4749f7 2020-10-02 op 
837 3e4749f7 2020-10-02 op 		case 'd':
838 231bfcdc 2020-12-21 op 			free((char*)dir);
839 231bfcdc 2020-12-21 op 			if ((dir = absolutify_path(optarg)) == NULL)
840 231bfcdc 2020-12-21 op 				err(1, "absolutify_path");
841 3e4749f7 2020-10-02 op 			break;
842 3e4749f7 2020-10-02 op 
843 d7802bb4 2020-12-02 op 		case 'f':
844 d7802bb4 2020-12-02 op 			foreground = 1;
845 d7802bb4 2020-12-02 op 			break;
846 d7802bb4 2020-12-02 op 
847 3e4749f7 2020-10-02 op 		case 'h':
848 3e4749f7 2020-10-02 op 			usage(*argv);
849 3e4749f7 2020-10-02 op 			return 0;
850 3e4749f7 2020-10-02 op 
851 3e4749f7 2020-10-02 op 		case 'k':
852 3e4749f7 2020-10-02 op 			key = optarg;
853 3e4749f7 2020-10-02 op 			break;
854 3e4749f7 2020-10-02 op 
855 721e2325 2020-11-18 op 		case 'p': {
856 721e2325 2020-11-18 op 			char *ep;
857 721e2325 2020-11-18 op 			long lval;
858 721e2325 2020-11-18 op 
859 721e2325 2020-11-18 op 			errno = 0;
860 721e2325 2020-11-18 op 			lval = strtol(optarg, &ep, 10);
861 721e2325 2020-11-18 op 			if (optarg[0] == '\0' || *ep != '\0')
862 721e2325 2020-11-18 op 				err(1, "not a number: %s", optarg);
863 721e2325 2020-11-18 op 			if (lval < 0 || lval > UINT16_MAX)
864 721e2325 2020-11-18 op 				err(1, "port number out of range: %s", optarg);
865 721e2325 2020-11-18 op 			port = lval;
866 721e2325 2020-11-18 op 			break;
867 721e2325 2020-11-18 op 		}
868 721e2325 2020-11-18 op 
869 72342dc9 2020-11-06 op 		case 'x':
870 72f653b6 2020-11-06 op 			cgi = optarg;
871 72342dc9 2020-11-06 op 			break;
872 72342dc9 2020-11-06 op 
873 3e4749f7 2020-10-02 op 		default:
874 3e4749f7 2020-10-02 op 			usage(*argv);
875 3e4749f7 2020-10-02 op 			return 1;
876 3e4749f7 2020-10-02 op 		}
877 3e4749f7 2020-10-02 op 	}
878 3e4749f7 2020-10-02 op 
879 4a28dd01 2020-12-28 op 	signal(SIGPIPE, SIG_IGN);
880 4a28dd01 2020-12-28 op 	signal(SIGCHLD, SIG_IGN);
881 4a28dd01 2020-12-28 op 
882 4a28dd01 2020-12-28 op #ifdef SIGINFO
883 4a28dd01 2020-12-28 op 	signal(SIGINFO, sig_handler);
884 4a28dd01 2020-12-28 op #endif
885 4a28dd01 2020-12-28 op 	signal(SIGUSR2, sig_handler);
886 4a28dd01 2020-12-28 op 
887 4a28dd01 2020-12-28 op 	if (!foreground)
888 4a28dd01 2020-12-28 op 		signal(SIGHUP, SIG_IGN);
889 4a28dd01 2020-12-28 op 
890 3e4749f7 2020-10-02 op 	if ((conf = tls_config_new()) == NULL)
891 3e4749f7 2020-10-02 op 		err(1, "tls_config_new");
892 0d8ca45a 2020-10-03 op 
893 677afbd3 2020-12-02 op 	/* optionally accept client certs, but don't try to verify them */
894 677afbd3 2020-12-02 op 	tls_config_verify_client_optional(conf);
895 677afbd3 2020-12-02 op 	tls_config_insecure_noverifycert(conf);
896 677afbd3 2020-12-02 op 
897 0d8ca45a 2020-10-03 op 	if (tls_config_set_protocols(conf,
898 0d8ca45a 2020-10-03 op 	    TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
899 0d8ca45a 2020-10-03 op 		err(1, "tls_config_set_protocols");
900 3e4749f7 2020-10-02 op 
901 4d4f0e19 2020-10-03 op 	if (tls_config_set_cert_file(conf, cert) == -1)
902 4d4f0e19 2020-10-03 op 		err(1, "tls_config_set_cert_file: %s", cert);
903 3e4749f7 2020-10-02 op 
904 4d4f0e19 2020-10-03 op 	if (tls_config_set_key_file(conf, key) == -1)
905 4d4f0e19 2020-10-03 op 		err(1, "tls_config_set_key_file: %s", key);
906 3e4749f7 2020-10-02 op 
907 3e4749f7 2020-10-02 op 	if ((ctx = tls_server()) == NULL)
908 3e4749f7 2020-10-02 op 		err(1, "tls_server");
909 3e4749f7 2020-10-02 op 
910 3e4749f7 2020-10-02 op 	if (tls_configure(ctx, conf) == -1)
911 3e4749f7 2020-10-02 op 		errx(1, "tls_configure: %s", tls_error(ctx));
912 3e4749f7 2020-10-02 op 
913 721e2325 2020-11-18 op 	sock = make_socket(port, AF_INET);
914 3e4749f7 2020-10-02 op 
915 3e4749f7 2020-10-02 op 	if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
916 3e4749f7 2020-10-02 op 		err(1, "open: %s", dir);
917 3e4749f7 2020-10-02 op 
918 d7802bb4 2020-12-02 op 	if (!foreground && daemon(0, 1) == -1)
919 d7802bb4 2020-12-02 op 		exit(1);
920 d7802bb4 2020-12-02 op 
921 4c416739 2020-01-01 op 	if (unveil(dir, "rx") == -1)
922 4c416739 2020-01-01 op 		err(1, "unveil");
923 3e4749f7 2020-10-02 op 
924 4c416739 2020-01-01 op 	if (pledge("stdio rpath inet proc exec", NULL) == -1)
925 4c416739 2020-01-01 op 		err(1, "pledge");
926 4c416739 2020-01-01 op 
927 4c416739 2020-01-01 op 	/* drop proc and exec if cgi isn't enabled */
928 4c416739 2020-01-01 op 	if (cgi == NULL && pledge("stdio rpath inet", NULL) == -1)
929 4c416739 2020-01-01 op 		err(1, "pledge");
930 4c416739 2020-01-01 op 
931 3e4749f7 2020-10-02 op 	loop(ctx, sock);
932 3e4749f7 2020-10-02 op 
933 3e4749f7 2020-10-02 op 	close(sock);
934 3e4749f7 2020-10-02 op 	tls_free(ctx);
935 3e4749f7 2020-10-02 op 	tls_config_free(conf);
936 3e4749f7 2020-10-02 op }