2 3e4749f7 2020-10-02 op * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
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.
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.
17 f28f9311 2020-10-14 op #include <sys/mman.h>
18 3e4749f7 2020-10-02 op #include <sys/stat.h>
20 3e4749f7 2020-10-02 op #include <assert.h>
21 3e4749f7 2020-10-02 op #include <err.h>
22 592fd624 2020-10-07 op #include <errno.h>
23 3e4749f7 2020-10-02 op #include <fcntl.h>
24 231bfcdc 2020-12-21 op #include <limits.h>
25 709d6e5e 2021-01-10 op #include <netdb.h>
26 0cf902af 2020-11-03 op #include <signal.h>
27 80bbcad5 2021-01-10 op #include <stdarg.h>
28 3e4749f7 2020-10-02 op #include <string.h>
30 488f059a 2020-12-24 op #include "gmid.h"
32 80bbcad5 2021-01-10 op #define LOGE(c, fmt, ...) logs(LOG_ERR, c, fmt, __VA_ARGS__)
33 80bbcad5 2021-01-10 op #define LOGN(c, fmt, ...) logs(LOG_NOTICE, c, fmt, __VA_ARGS__)
34 80bbcad5 2021-01-10 op #define LOGI(c, fmt, ...) logs(LOG_INFO, c, fmt, __VA_ARGS__)
35 80bbcad5 2021-01-10 op #define LOGD(c, fmt, ...) logs(LOG_DEBUG, c, fmt, __VA_ARGS__)
37 d7802bb4 2020-12-02 op const char *dir, *cgi;
40 d7802bb4 2020-12-02 op int foreground;
41 120381c9 2020-11-06 op int connected_clients;
43 33d32d1f 2020-12-25 op struct etm { /* file extension to mime */
44 33d32d1f 2020-12-25 op const char *mime;
45 33d32d1f 2020-12-25 op const char *ext;
46 33d32d1f 2020-12-25 op } filetypes[] = {
47 33d32d1f 2020-12-25 op {"application/pdf", "pdf"},
49 33d32d1f 2020-12-25 op {"image/gif", "gif"},
50 33d32d1f 2020-12-25 op {"image/jpeg", "jpg"},
51 33d32d1f 2020-12-25 op {"image/jpeg", "jpeg"},
52 33d32d1f 2020-12-25 op {"image/png", "png"},
53 33d32d1f 2020-12-25 op {"image/svg+xml", "svg"},
55 33d32d1f 2020-12-25 op {"text/gemini", "gemini"},
56 33d32d1f 2020-12-25 op {"text/gemini", "gmi"},
57 33d32d1f 2020-12-25 op {"text/markdown", "markdown"},
58 33d32d1f 2020-12-25 op {"text/markdown", "md"},
59 33d32d1f 2020-12-25 op {"text/plain", "txt"},
60 33d32d1f 2020-12-25 op {"text/xml", "xml"},
65 9b374f41 2021-01-10 op static inline void
66 9b374f41 2021-01-10 op safe_setenv(const char *name, const char *val)
68 9b374f41 2021-01-10 op if (val == NULL)
70 9b374f41 2021-01-10 op setenv(name, val, 1);
73 80bbcad5 2021-01-10 op __attribute__ ((format (printf, 1, 2)))
74 0d7a38c4 2021-01-11 op __attribute__ ((__noreturn__))
75 0d7a38c4 2021-01-11 op static inline void
76 80bbcad5 2021-01-10 op fatal(const char *fmt, ...)
80 80bbcad5 2021-01-10 op va_start(ap, fmt);
82 80bbcad5 2021-01-10 op if (foreground) {
83 80bbcad5 2021-01-10 op vfprintf(stderr, fmt, ap);
84 80bbcad5 2021-01-10 op fprintf(stderr, "\n");
86 80bbcad5 2021-01-10 op vsyslog(LOG_DAEMON | LOG_CRIT, fmt, ap);
92 80bbcad5 2021-01-10 op __attribute__ ((format (printf, 3, 4)))
93 80bbcad5 2021-01-10 op static inline void
94 709d6e5e 2021-01-10 op logs(int priority, struct client *c,
95 709d6e5e 2021-01-10 op const char *fmt, ...)
97 709d6e5e 2021-01-10 op char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
98 709d6e5e 2021-01-10 op char *fmted, *s;
103 80bbcad5 2021-01-10 op va_start(ap, fmt);
105 709d6e5e 2021-01-10 op len = sizeof(c->addr);
106 709d6e5e 2021-01-10 op ec = getnameinfo((struct sockaddr*)&c->addr, len,
107 709d6e5e 2021-01-10 op hbuf, sizeof(hbuf),
108 709d6e5e 2021-01-10 op sbuf, sizeof(sbuf),
109 709d6e5e 2021-01-10 op NI_NUMERICHOST | NI_NUMERICSERV);
111 709d6e5e 2021-01-10 op fatal("getnameinfo: %s", gai_strerror(ec));
113 709d6e5e 2021-01-10 op if (vasprintf(&fmted, fmt, ap) == -1)
114 709d6e5e 2021-01-10 op fatal("vasprintf: %s", strerror(errno));
116 709d6e5e 2021-01-10 op if (foreground)
117 709d6e5e 2021-01-10 op fprintf(stderr, "%s:%s %s\n", hbuf, sbuf, fmted);
119 709d6e5e 2021-01-10 op if (asprintf(&s, "%s:%s %s", hbuf, sbuf, fmted) == -1)
120 709d6e5e 2021-01-10 op fatal("asprintf: %s", strerror(errno));
121 709d6e5e 2021-01-10 op syslog(priority | LOG_DAEMON, "%s", s);
131 4a28dd01 2020-12-28 op sig_handler(int sig)
137 72f653b6 2020-11-06 op starts_with(const char *str, const char *prefix)
141 72f653b6 2020-11-06 op for (i = 0; prefix[i] != '\0'; ++i)
142 72f653b6 2020-11-06 op if (str[i] != prefix[i])
148 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
150 3e4749f7 2020-10-02 op char buf[1030] = {0}; /* status + ' ' + max reply len + \r\n\0 */
154 592fd624 2020-10-07 op client->code = code;
155 592fd624 2020-10-07 op client->meta = reason;
156 592fd624 2020-10-07 op client->state = S_INITIALIZING;
158 3e4749f7 2020-10-02 op len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
159 3e4749f7 2020-10-02 op assert(len < (int)sizeof(buf));
160 592fd624 2020-10-07 op ret = tls_write(client->ctx, buf, len);
161 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
162 592fd624 2020-10-07 op pfd->events = POLLIN;
166 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
167 592fd624 2020-10-07 op pfd->events = POLLOUT;
175 f28f9311 2020-10-14 op filesize(int fd)
179 f28f9311 2020-10-14 op if ((len = lseek(fd, 0, SEEK_END)) == -1)
181 f28f9311 2020-10-14 op if (lseek(fd, 0, SEEK_SET) == -1)
187 cc68fe70 2020-10-07 op path_ext(const char *path)
189 cc68fe70 2020-10-07 op const char *end;
191 cc68fe70 2020-10-07 op end = path + strlen(path)-1; /* the last byte before the NUL */
192 cc68fe70 2020-10-07 op for (; end != path; --end) {
193 cc68fe70 2020-10-07 op if (*end == '.')
194 cc68fe70 2020-10-07 op return end+1;
195 cc68fe70 2020-10-07 op if (*end == '/')
203 cc68fe70 2020-10-07 op mime(const char *path)
205 cc68fe70 2020-10-07 op const char *ext, *def = "application/octet-stream";
206 cc68fe70 2020-10-07 op struct etm *t;
208 cc68fe70 2020-10-07 op if ((ext = path_ext(path)) == NULL)
211 cc68fe70 2020-10-07 op for (t = filetypes; t->mime != NULL; ++t)
212 cc68fe70 2020-10-07 op if (!strcmp(ext, t->ext))
213 cc68fe70 2020-10-07 op return t->mime;
219 d7802bb4 2020-12-02 op check_path(struct client *c, const char *path, int *fd)
221 72342dc9 2020-11-06 op struct stat sb;
223 f28f9311 2020-10-14 op assert(path != NULL);
224 33d32d1f 2020-12-25 op if ((*fd = openat(dirfd, *path ? path : ".",
225 a5d310bc 2020-11-10 op O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
226 a5d310bc 2020-11-10 op return FILE_MISSING;
229 a5d310bc 2020-11-10 op if (fstat(*fd, &sb) == -1) {
230 d7802bb4 2020-12-02 op LOGN(c, "failed stat for %s: %s", path, strerror(errno));
231 a5d310bc 2020-11-10 op return FILE_MISSING;
234 a5d310bc 2020-11-10 op if (S_ISDIR(sb.st_mode))
235 a5d310bc 2020-11-10 op return FILE_DIRECTORY;
237 a5d310bc 2020-11-10 op if (sb.st_mode & S_IXUSR)
238 a5d310bc 2020-11-10 op return FILE_EXECUTABLE;
240 a5d310bc 2020-11-10 op return FILE_EXISTS;
244 a5d310bc 2020-11-10 op * the inverse of this algorithm, i.e. starting from the start of the
245 a5d310bc 2020-11-10 op * path + strlen(cgi), and checking if each component, should be
246 a5d310bc 2020-11-10 op * faster. But it's tedious to write. This does the opposite: starts
247 a5d310bc 2020-11-10 op * from the end and strip one component at a time, until either an
248 a5d310bc 2020-11-10 op * executable is found or we emptied the path.
251 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
254 a5d310bc 2020-11-10 op end = strchr(path, '\0');
256 a5d310bc 2020-11-10 op /* NB: assume CGI is enabled and path matches cgi */
258 a5d310bc 2020-11-10 op while (end > path) {
259 a5d310bc 2020-11-10 op /* go up one level. UNIX paths are simple and POSIX
260 a5d310bc 2020-11-10 op * dirname, with its ambiguities on if the given path
261 a5d310bc 2020-11-10 op * is changed or not, gives me headaches. */
262 a5d310bc 2020-11-10 op while (*end != '/')
266 d7802bb4 2020-12-02 op switch (check_path(c, path, &c->fd)) {
267 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
268 a5d310bc 2020-11-10 op return start_cgi(path, end+1, query, fds,c);
269 a5d310bc 2020-11-10 op case FILE_MISSING:
280 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
282 a5d310bc 2020-11-10 op goodbye(fds, c);
288 33d32d1f 2020-12-25 op open_file(char *fpath, char *query, struct pollfd *fds, struct client *c)
290 d7802bb4 2020-12-02 op switch (check_path(c, fpath, &c->fd)) {
291 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
292 5a40216f 2020-12-28 op if (cgi != NULL && starts_with(fpath, cgi))
293 a5d310bc 2020-11-10 op return start_cgi(fpath, "", query, fds, c);
295 a5d310bc 2020-11-10 op /* fallthrough */
297 a5d310bc 2020-11-10 op case FILE_EXISTS:
298 a5d310bc 2020-11-10 op if ((c->len = filesize(c->fd)) == -1) {
299 d7802bb4 2020-12-02 op LOGE(c, "failed to get file size for %s", fpath);
300 a5d310bc 2020-11-10 op goodbye(fds, c);
304 a5d310bc 2020-11-10 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
305 a5d310bc 2020-11-10 op c->fd, 0)) == MAP_FAILED) {
306 a5d310bc 2020-11-10 op warn("mmap: %s", fpath);
307 a5d310bc 2020-11-10 op goodbye(fds, c);
310 a5d310bc 2020-11-10 op c->i = c->buf;
311 a5d310bc 2020-11-10 op return start_reply(fds, c, SUCCESS, mime(fpath));
313 a5d310bc 2020-11-10 op case FILE_DIRECTORY:
314 d7802bb4 2020-12-02 op LOGD(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
315 f28f9311 2020-10-14 op close(c->fd);
317 f28f9311 2020-10-14 op send_dir(fpath, fds, c);
320 a5d310bc 2020-11-10 op case FILE_MISSING:
321 5a40216f 2020-12-28 op if (cgi != NULL && starts_with(fpath, cgi))
322 a5d310bc 2020-11-10 op return check_for_cgi(fpath, query, fds, c);
324 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
326 f28f9311 2020-10-14 op goodbye(fds, c);
330 a5d310bc 2020-11-10 op /* unreachable */
336 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
337 75d233f0 2020-11-06 op struct pollfd *fds, struct client *c)
340 a5d310bc 2020-11-10 op int p[2]; /* read end, write end */
342 72342dc9 2020-11-06 op if (pipe(p) == -1)
345 72342dc9 2020-11-06 op switch (pid = fork()) {
349 a5d310bc 2020-11-10 op case 0: { /* child */
350 721e2325 2020-11-18 op char *ex, *requri, *portno;
351 85dff1f9 2021-01-11 op char addr[NI_MAXHOST];
352 72342dc9 2020-11-06 op char *argv[] = { NULL, NULL, NULL };
356 72342dc9 2020-11-06 op if (dup2(p[1], 1) == -1)
357 72342dc9 2020-11-06 op goto childerr;
359 72342dc9 2020-11-06 op if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
360 a5d310bc 2020-11-10 op goto childerr;
362 85dff1f9 2021-01-11 op ec = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
363 85dff1f9 2021-01-11 op addr, sizeof(addr),
365 85dff1f9 2021-01-11 op NI_NUMERICHOST | NI_NUMERICSERV);
367 85dff1f9 2021-01-11 op goto childerr;
369 721e2325 2020-11-18 op if (asprintf(&portno, "%d", port) == -1)
370 721e2325 2020-11-18 op goto childerr;
372 5a40216f 2020-12-28 op if (asprintf(&ex, "%s/%s", dir, spath) == -1)
373 72342dc9 2020-11-06 op goto childerr;
375 a5d310bc 2020-11-10 op if (asprintf(&requri, "%s%s%s", spath,
376 a5d310bc 2020-11-10 op *relpath == '\0' ? "" : "/",
377 a5d310bc 2020-11-10 op relpath) == -1)
378 a5d310bc 2020-11-10 op goto childerr;
380 a5d310bc 2020-11-10 op argv[0] = argv[1] = ex;
382 60ba426e 2020-11-06 op /* fix the env */
383 9b374f41 2021-01-10 op safe_setenv("GATEWAY_INTERFACE", "CGI/1.1");
384 9b374f41 2021-01-10 op safe_setenv("SERVER_SOFTWARE", "gmid");
385 9b374f41 2021-01-10 op safe_setenv("SERVER_PORT", portno);
386 a5d310bc 2020-11-10 op /* setenv("SERVER_NAME", "", 1); */
387 9b374f41 2021-01-10 op safe_setenv("SCRIPT_NAME", spath);
388 9b374f41 2021-01-10 op safe_setenv("SCRIPT_EXECUTABLE", ex);
389 9b374f41 2021-01-10 op safe_setenv("REQUEST_URI", requri);
390 9b374f41 2021-01-10 op safe_setenv("REQUEST_RELATIVE", relpath);
391 9b374f41 2021-01-10 op safe_setenv("QUERY_STRING", query);
392 9b374f41 2021-01-10 op safe_setenv("REMOTE_HOST", addr);
393 9b374f41 2021-01-10 op safe_setenv("REMOTE_ADDR", addr);
394 9b374f41 2021-01-10 op safe_setenv("DOCUMENT_ROOT", dir);
396 677afbd3 2020-12-02 op if (tls_peer_cert_provided(c->ctx)) {
397 9b374f41 2021-01-10 op safe_setenv("AUTH_TYPE", "Certificate");
398 9b374f41 2021-01-10 op safe_setenv("REMOTE_USER", tls_peer_cert_subject(c->ctx));
399 9b374f41 2021-01-10 op safe_setenv("TLS_CLIENT_ISSUER", tls_peer_cert_issuer(c->ctx));
400 9b374f41 2021-01-10 op safe_setenv("TLS_CLIENT_HASH", tls_peer_cert_hash(c->ctx));
403 a5d310bc 2020-11-10 op execvp(ex, argv);
404 72342dc9 2020-11-06 op goto childerr;
407 72342dc9 2020-11-06 op default: /* parent */
409 72342dc9 2020-11-06 op close(c->fd);
410 72342dc9 2020-11-06 op c->fd = p[0];
411 72342dc9 2020-11-06 op c->child = pid;
412 aff8d190 2020-11-06 op mark_nonblock(c->fd);
413 aff8d190 2020-11-06 op c->state = S_SENDING;
414 72342dc9 2020-11-06 op handle_cgi(fds, c);
419 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
421 72342dc9 2020-11-06 op goodbye(fds, c);
425 72342dc9 2020-11-06 op dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
431 6c6c7a0e 2020-12-28 op cgi_poll_on_child(struct pollfd *fds, struct client *c)
435 aff8d190 2020-11-06 op if (c->waiting_on_child)
437 aff8d190 2020-11-06 op c->waiting_on_child = 1;
439 aff8d190 2020-11-06 op fds->events = POLLIN;
441 aff8d190 2020-11-06 op fd = fds->fd;
442 aff8d190 2020-11-06 op fds->fd = c->fd;
447 6c6c7a0e 2020-12-28 op cgi_poll_on_client(struct pollfd *fds, struct client *c)
451 aff8d190 2020-11-06 op if (!c->waiting_on_child)
453 aff8d190 2020-11-06 op c->waiting_on_child = 0;
455 aff8d190 2020-11-06 op fd = fds->fd;
456 aff8d190 2020-11-06 op fds->fd = c->fd;
461 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
465 aff8d190 2020-11-06 op /* ensure c->fd is the child and fds->fd the client */
466 6c6c7a0e 2020-12-28 op cgi_poll_on_client(fds, c);
469 aff8d190 2020-11-06 op if (c->len == 0) {
470 aff8d190 2020-11-06 op if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
472 aff8d190 2020-11-06 op if (r == -1) {
473 aff8d190 2020-11-06 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
474 6c6c7a0e 2020-12-28 op cgi_poll_on_child(fds, c);
483 aff8d190 2020-11-06 op while (c->len > 0) {
484 aff8d190 2020-11-06 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
488 72342dc9 2020-11-06 op case TLS_WANT_POLLOUT:
489 aff8d190 2020-11-06 op fds->events = POLLOUT;
492 72342dc9 2020-11-06 op case TLS_WANT_POLLIN:
493 aff8d190 2020-11-06 op fds->events = POLLIN;
505 72342dc9 2020-11-06 op goodbye(fds, c);
509 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
511 f28f9311 2020-10-14 op ssize_t ret, len;
513 f28f9311 2020-10-14 op if (c->fd == -1) {
514 75d233f0 2020-11-06 op if (!open_file(path, query, fds, c))
516 f28f9311 2020-10-14 op c->state = S_SENDING;
519 f28f9311 2020-10-14 op len = (c->buf + c->len) - c->i;
521 f28f9311 2020-10-14 op while (len > 0) {
522 f28f9311 2020-10-14 op switch (ret = tls_write(c->ctx, c->i, len)) {
524 d7802bb4 2020-12-02 op LOGE(c, "tls_write: %s", tls_error(c->ctx));
525 f28f9311 2020-10-14 op goodbye(fds, c);
528 f28f9311 2020-10-14 op case TLS_WANT_POLLIN:
529 f28f9311 2020-10-14 op fds->events = POLLIN;
532 f28f9311 2020-10-14 op case TLS_WANT_POLLOUT:
533 f28f9311 2020-10-14 op fds->events = POLLOUT;
543 f28f9311 2020-10-14 op goodbye(fds, c);
547 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
549 3e4749f7 2020-10-02 op char fpath[PATHBUF];
552 3e4749f7 2020-10-02 op bzero(fpath, PATHBUF);
554 9c56b0a7 2020-10-14 op if (path[0] != '.')
555 3e4749f7 2020-10-02 op fpath[0] = '.';
557 3e4749f7 2020-10-02 op /* this cannot fail since sizeof(fpath) > maxlen of path */
558 3e4749f7 2020-10-02 op strlcat(fpath, path, PATHBUF);
559 3e4749f7 2020-10-02 op len = strlen(fpath);
561 3e4749f7 2020-10-02 op /* add a trailing / in case. */
562 3e4749f7 2020-10-02 op if (fpath[len-1] != '/') {
563 3e4749f7 2020-10-02 op fpath[len] = '/';
566 3e4749f7 2020-10-02 op strlcat(fpath, "index.gmi", sizeof(fpath));
568 75d233f0 2020-11-06 op send_file(fpath, NULL, fds, client);
572 9862b637 2021-01-13 op handle_handshake(struct pollfd *fds, struct client *c)
574 9862b637 2021-01-13 op switch (tls_handshake(c->ctx)) {
575 9862b637 2021-01-13 op case 0: /* success */
576 9862b637 2021-01-13 op case -1: /* already handshaked */
578 9862b637 2021-01-13 op case TLS_WANT_POLLIN:
579 9862b637 2021-01-13 op fds->events = POLLIN;
581 9862b637 2021-01-13 op case TLS_WANT_POLLOUT:
582 9862b637 2021-01-13 op fds->events = POLLOUT;
585 9862b637 2021-01-13 op /* unreachable */
589 9862b637 2021-01-13 op /* TODO: check SNI here */
590 9862b637 2021-01-13 op logs(LOG_DEBUG, c, "client wanted to talk to: %s", tls_conn_servername(c->ctx));
592 9862b637 2021-01-13 op c->state = S_OPEN;
593 9862b637 2021-01-13 op handle_open_conn(fds, c);
597 9862b637 2021-01-13 op handle_open_conn(struct pollfd *fds, struct client *c)
599 592fd624 2020-10-07 op char buf[GEMINI_URL_LEN];
600 9862b637 2021-01-13 op const char *parse_err = "invalid request";
601 3c1cf9d0 2021-01-11 op struct iri iri;
603 9862b637 2021-01-13 op bzero(buf, sizeof(buf));
605 9862b637 2021-01-13 op switch (tls_read(c->ctx, buf, sizeof(buf)-1)) {
607 9862b637 2021-01-13 op LOGE(c, "tls_read: %s", tls_error(c->ctx));
608 9862b637 2021-01-13 op goodbye(fds, c);
611 9862b637 2021-01-13 op case TLS_WANT_POLLIN:
612 9862b637 2021-01-13 op fds->events = POLLIN;
615 9862b637 2021-01-13 op case TLS_WANT_POLLOUT:
616 9862b637 2021-01-13 op fds->events = POLLOUT;
620 9862b637 2021-01-13 op if (!trim_req_iri(buf) || !parse_iri(buf, &iri, &parse_err)) {
621 9862b637 2021-01-13 op if (!start_reply(fds, c, BAD_REQUEST, parse_err))
623 9862b637 2021-01-13 op goodbye(fds, c);
627 9862b637 2021-01-13 op if (strcmp(iri.schema, "gemini")) {
628 9862b637 2021-01-13 op if (!start_reply(fds, c, PROXY_REFUSED, "won't proxy request"))
630 9862b637 2021-01-13 op goodbye(fds, c);
634 9862b637 2021-01-13 op LOGI(c, "GET %s%s%s",
635 9862b637 2021-01-13 op *iri.path ? iri.path : "/",
636 9862b637 2021-01-13 op *iri.query ? "?" : "",
637 9862b637 2021-01-13 op *iri.query ? iri.query : "");
639 9862b637 2021-01-13 op send_file(iri.path, iri.query, fds, c);
643 9862b637 2021-01-13 op handle(struct pollfd *fds, struct client *client)
645 9862b637 2021-01-13 op switch (client->state) {
646 9862b637 2021-01-13 op case S_HANDSHAKE:
647 9862b637 2021-01-13 op handle_handshake(fds, client);
651 9862b637 2021-01-13 op handle_open_conn(fds, client);
654 592fd624 2020-10-07 op case S_INITIALIZING:
655 592fd624 2020-10-07 op if (!start_reply(fds, client, client->code, client->meta))
658 592fd624 2020-10-07 op if (client->code != SUCCESS) {
659 592fd624 2020-10-07 op /* we don't need a body */
660 592fd624 2020-10-07 op goodbye(fds, client);
664 592fd624 2020-10-07 op client->state = S_SENDING;
666 592fd624 2020-10-07 op /* fallthrough */
668 592fd624 2020-10-07 op case S_SENDING:
669 aff8d190 2020-11-06 op if (client->child != -1)
670 aff8d190 2020-11-06 op handle_cgi(fds, client);
672 aff8d190 2020-11-06 op send_file(NULL, NULL, fds, client);
675 592fd624 2020-10-07 op case S_CLOSING:
676 592fd624 2020-10-07 op goodbye(fds, client);
680 592fd624 2020-10-07 op /* unreachable */
686 592fd624 2020-10-07 op mark_nonblock(int fd)
690 592fd624 2020-10-07 op if ((flags = fcntl(fd, F_GETFL)) == -1)
691 80bbcad5 2021-01-10 op fatal("fcntl(F_GETFL): %s", strerror(errno));
692 592fd624 2020-10-07 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
693 80bbcad5 2021-01-10 op fatal("fcntl(F_SETFL): %s", strerror(errno));
697 9468027b 2020-10-15 op make_socket(int port, int family)
700 9468027b 2020-10-15 op struct sockaddr_in addr4;
701 9468027b 2020-10-15 op struct sockaddr_in6 addr6;
702 9468027b 2020-10-15 op struct sockaddr *addr;
703 9468027b 2020-10-15 op socklen_t len;
705 9468027b 2020-10-15 op switch (family) {
706 9468027b 2020-10-15 op case AF_INET:
707 9468027b 2020-10-15 op bzero(&addr4, sizeof(addr4));
708 9468027b 2020-10-15 op addr4.sin_family = family;
709 9468027b 2020-10-15 op addr4.sin_port = htons(port);
710 9468027b 2020-10-15 op addr4.sin_addr.s_addr = INADDR_ANY;
711 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr4;
712 9468027b 2020-10-15 op len = sizeof(addr4);
715 9468027b 2020-10-15 op case AF_INET6:
716 9468027b 2020-10-15 op bzero(&addr6, sizeof(addr6));
717 9468027b 2020-10-15 op addr6.sin6_family = AF_INET6;
718 9468027b 2020-10-15 op addr6.sin6_port = htons(port);
719 9468027b 2020-10-15 op addr6.sin6_addr = in6addr_any;
720 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr6;
721 9468027b 2020-10-15 op len = sizeof(addr6);
725 9468027b 2020-10-15 op /* unreachable */
729 9468027b 2020-10-15 op if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
730 80bbcad5 2021-01-10 op fatal("socket: %s", strerror(errno));
733 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
734 80bbcad5 2021-01-10 op fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
737 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
738 80bbcad5 2021-01-10 op fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
740 592fd624 2020-10-07 op mark_nonblock(sock);
742 9468027b 2020-10-15 op if (bind(sock, addr, len) == -1)
743 80bbcad5 2021-01-10 op fatal("bind: %s", strerror(errno));
745 3e4749f7 2020-10-02 op if (listen(sock, 16) == -1)
746 80bbcad5 2021-01-10 op fatal("listen: %s", strerror(errno));
752 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
755 709d6e5e 2021-01-10 op struct sockaddr_storage addr;
756 3e4749f7 2020-10-02 op socklen_t len;
758 592fd624 2020-10-07 op len = sizeof(addr);
759 592fd624 2020-10-07 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
760 592fd624 2020-10-07 op if (errno == EWOULDBLOCK)
762 80bbcad5 2021-01-10 op fatal("accept: %s", strerror(errno));
765 592fd624 2020-10-07 op mark_nonblock(fd);
767 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
768 592fd624 2020-10-07 op if (fds[i].fd == -1) {
769 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
770 592fd624 2020-10-07 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
771 592fd624 2020-10-07 op break; /* goodbye fd! */
773 592fd624 2020-10-07 op fds[i].fd = fd;
774 592fd624 2020-10-07 op fds[i].events = POLLIN;
776 9862b637 2021-01-13 op clients[i].state = S_HANDSHAKE;
777 592fd624 2020-10-07 op clients[i].fd = -1;
778 72342dc9 2020-11-06 op clients[i].child = -1;
779 f28f9311 2020-10-14 op clients[i].buf = MAP_FAILED;
780 2c3a40fa 2020-11-06 op clients[i].af = AF_INET;
781 709d6e5e 2021-01-10 op clients[i].addr = addr;
783 120381c9 2020-11-06 op connected_clients++;
792 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
796 592fd624 2020-10-07 op c->state = S_CLOSING;
798 592fd624 2020-10-07 op ret = tls_close(c->ctx);
799 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
800 592fd624 2020-10-07 op pfd->events = POLLIN;
803 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
804 592fd624 2020-10-07 op pfd->events = POLLOUT;
808 120381c9 2020-11-06 op connected_clients--;
810 592fd624 2020-10-07 op tls_free(c->ctx);
811 592fd624 2020-10-07 op c->ctx = NULL;
813 f28f9311 2020-10-14 op if (c->buf != MAP_FAILED)
814 f28f9311 2020-10-14 op munmap(c->buf, c->len);
816 592fd624 2020-10-07 op if (c->fd != -1)
817 592fd624 2020-10-07 op close(c->fd);
819 592fd624 2020-10-07 op close(pfd->fd);
820 592fd624 2020-10-07 op pfd->fd = -1;
824 33756bd2 2021-01-10 op loop(struct tls *ctx, int sock4, int sock6)
827 592fd624 2020-10-07 op struct client clients[MAX_USERS];
828 592fd624 2020-10-07 op struct pollfd fds[MAX_USERS];
830 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
831 592fd624 2020-10-07 op fds[i].fd = -1;
832 592fd624 2020-10-07 op fds[i].events = POLLIN;
833 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
836 33756bd2 2021-01-10 op fds[0].fd = sock4;
837 33756bd2 2021-01-10 op fds[1].fd = sock6;
840 16ace04d 2021-01-08 op if (poll(fds, MAX_USERS, INFTIM) == -1) {
841 120381c9 2020-11-06 op if (errno == EINTR) {
842 d7802bb4 2020-12-02 op warnx("connected clients: %d",
843 d7802bb4 2020-12-02 op connected_clients);
846 80bbcad5 2021-01-10 op fatal("poll: %s", strerror(errno));
849 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; i++) {
850 592fd624 2020-10-07 op if (fds[i].revents == 0)
853 592fd624 2020-10-07 op if (fds[i].revents & (POLLERR|POLLNVAL))
854 80bbcad5 2021-01-10 op fatal("bad fd %d: %s", fds[i].fd,
855 d7802bb4 2020-12-02 op strerror(errno));
857 592fd624 2020-10-07 op if (fds[i].revents & POLLHUP) {
858 aff8d190 2020-11-06 op /* fds[i] may be the fd of the stdin
859 aff8d190 2020-11-06 op * of a cgi script that has exited. */
860 aff8d190 2020-11-06 op if (!clients[i].waiting_on_child) {
861 aff8d190 2020-11-06 op goodbye(&fds[i], &clients[i]);
866 33756bd2 2021-01-10 op if (fds[i].fd == sock4)
867 33756bd2 2021-01-10 op do_accept(sock4, ctx, fds, clients);
868 33756bd2 2021-01-10 op else if (fds[i].fd == sock6)
869 33756bd2 2021-01-10 op do_accept(sock6, ctx, fds, clients);
871 33756bd2 2021-01-10 op handle(&fds[i], &clients[i]);
877 231bfcdc 2020-12-21 op absolutify_path(const char *path)
879 231bfcdc 2020-12-21 op char *wd, *r;
881 231bfcdc 2020-12-21 op if (*path == '/')
882 231bfcdc 2020-12-21 op return strdup(path);
884 231bfcdc 2020-12-21 op wd = getwd(NULL);
885 231bfcdc 2020-12-21 op if (asprintf(&r, "%s/%s", wd, path) == -1)
886 231bfcdc 2020-12-21 op err(1, "asprintf");
892 3e4749f7 2020-10-02 op usage(const char *me)
894 3e4749f7 2020-10-02 op fprintf(stderr,
895 72f653b6 2020-11-06 op "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem] "
896 721e2325 2020-11-18 op "[-l logfile] [-p port] [-x cgi-bin]\n",
901 3e4749f7 2020-10-02 op main(int argc, char **argv)
903 72342dc9 2020-11-06 op const char *cert = "cert.pem", *key = "key.pem";
904 3e4749f7 2020-10-02 op struct tls *ctx = NULL;
905 3e4749f7 2020-10-02 op struct tls_config *conf;
906 85dff1f9 2021-01-11 op int sock4, sock6, enable_ipv6, ch;
907 120381c9 2020-11-06 op connected_clients = 0;
909 51d876f0 2020-12-21 op if ((dir = absolutify_path("docs")) == NULL)
910 51d876f0 2020-12-21 op err(1, "absolutify_path");
914 d7802bb4 2020-12-02 op foreground = 0;
915 85dff1f9 2021-01-11 op enable_ipv6 = 0;
917 85dff1f9 2021-01-11 op while ((ch = getopt(argc, argv, "6c:d:fhk:p:x:")) != -1) {
918 3e4749f7 2020-10-02 op switch (ch) {
920 85dff1f9 2021-01-11 op enable_ipv6 = 1;
924 3e4749f7 2020-10-02 op cert = optarg;
928 231bfcdc 2020-12-21 op free((char*)dir);
929 231bfcdc 2020-12-21 op if ((dir = absolutify_path(optarg)) == NULL)
930 231bfcdc 2020-12-21 op err(1, "absolutify_path");
934 d7802bb4 2020-12-02 op foreground = 1;
938 3e4749f7 2020-10-02 op usage(*argv);
942 3e4749f7 2020-10-02 op key = optarg;
950 721e2325 2020-11-18 op lval = strtol(optarg, &ep, 10);
951 721e2325 2020-11-18 op if (optarg[0] == '\0' || *ep != '\0')
952 721e2325 2020-11-18 op err(1, "not a number: %s", optarg);
953 721e2325 2020-11-18 op if (lval < 0 || lval > UINT16_MAX)
954 721e2325 2020-11-18 op err(1, "port number out of range: %s", optarg);
960 72f653b6 2020-11-06 op cgi = optarg;
964 3e4749f7 2020-10-02 op usage(*argv);
969 4a28dd01 2020-12-28 op signal(SIGPIPE, SIG_IGN);
970 4a28dd01 2020-12-28 op signal(SIGCHLD, SIG_IGN);
972 4a28dd01 2020-12-28 op #ifdef SIGINFO
973 4a28dd01 2020-12-28 op signal(SIGINFO, sig_handler);
975 4a28dd01 2020-12-28 op signal(SIGUSR2, sig_handler);
977 4a28dd01 2020-12-28 op if (!foreground)
978 4a28dd01 2020-12-28 op signal(SIGHUP, SIG_IGN);
980 3e4749f7 2020-10-02 op if ((conf = tls_config_new()) == NULL)
981 3e4749f7 2020-10-02 op err(1, "tls_config_new");
983 677afbd3 2020-12-02 op /* optionally accept client certs, but don't try to verify them */
984 677afbd3 2020-12-02 op tls_config_verify_client_optional(conf);
985 677afbd3 2020-12-02 op tls_config_insecure_noverifycert(conf);
987 0d8ca45a 2020-10-03 op if (tls_config_set_protocols(conf,
988 0d8ca45a 2020-10-03 op TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
989 0d8ca45a 2020-10-03 op err(1, "tls_config_set_protocols");
991 4d4f0e19 2020-10-03 op if (tls_config_set_cert_file(conf, cert) == -1)
992 4d4f0e19 2020-10-03 op err(1, "tls_config_set_cert_file: %s", cert);
994 4d4f0e19 2020-10-03 op if (tls_config_set_key_file(conf, key) == -1)
995 4d4f0e19 2020-10-03 op err(1, "tls_config_set_key_file: %s", key);
997 3e4749f7 2020-10-02 op if ((ctx = tls_server()) == NULL)
998 3e4749f7 2020-10-02 op err(1, "tls_server");
1000 3e4749f7 2020-10-02 op if (tls_configure(ctx, conf) == -1)
1001 3e4749f7 2020-10-02 op errx(1, "tls_configure: %s", tls_error(ctx));
1003 33756bd2 2021-01-10 op sock4 = make_socket(port, AF_INET);
1004 85dff1f9 2021-01-11 op if (enable_ipv6)
1005 85dff1f9 2021-01-11 op sock6 = make_socket(port, AF_INET6);
1009 3e4749f7 2020-10-02 op if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
1010 3e4749f7 2020-10-02 op err(1, "open: %s", dir);
1012 d7802bb4 2020-12-02 op if (!foreground && daemon(0, 1) == -1)
1015 4c416739 2020-01-01 op if (unveil(dir, "rx") == -1)
1016 4c416739 2020-01-01 op err(1, "unveil");
1018 4c416739 2020-01-01 op if (pledge("stdio rpath inet proc exec", NULL) == -1)
1019 4c416739 2020-01-01 op err(1, "pledge");
1021 4c416739 2020-01-01 op /* drop proc and exec if cgi isn't enabled */
1022 4c416739 2020-01-01 op if (cgi == NULL && pledge("stdio rpath inet", NULL) == -1)
1023 4c416739 2020-01-01 op err(1, "pledge");
1025 33756bd2 2021-01-10 op loop(ctx, sock4, sock6);
1027 33756bd2 2021-01-10 op close(sock4);
1028 33756bd2 2021-01-10 op close(sock6);
1029 3e4749f7 2020-10-02 op tls_free(ctx);
1030 3e4749f7 2020-10-02 op tls_config_free(conf);
