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 80bbcad5 2021-01-10 op static inline void __dead
75 80bbcad5 2021-01-10 op fatal(const char *fmt, ...)
79 80bbcad5 2021-01-10 op va_start(ap, fmt);
81 80bbcad5 2021-01-10 op if (foreground) {
82 80bbcad5 2021-01-10 op vfprintf(stderr, fmt, ap);
83 80bbcad5 2021-01-10 op fprintf(stderr, "\n");
85 80bbcad5 2021-01-10 op vsyslog(LOG_DAEMON | LOG_CRIT, fmt, ap);
91 80bbcad5 2021-01-10 op __attribute__ ((format (printf, 3, 4)))
92 80bbcad5 2021-01-10 op static inline void
93 709d6e5e 2021-01-10 op logs(int priority, struct client *c,
94 709d6e5e 2021-01-10 op const char *fmt, ...)
96 709d6e5e 2021-01-10 op char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
97 709d6e5e 2021-01-10 op char *fmted, *s;
102 80bbcad5 2021-01-10 op va_start(ap, fmt);
104 709d6e5e 2021-01-10 op len = sizeof(c->addr);
105 709d6e5e 2021-01-10 op ec = getnameinfo((struct sockaddr*)&c->addr, len,
106 709d6e5e 2021-01-10 op hbuf, sizeof(hbuf),
107 709d6e5e 2021-01-10 op sbuf, sizeof(sbuf),
108 709d6e5e 2021-01-10 op NI_NUMERICHOST | NI_NUMERICSERV);
110 709d6e5e 2021-01-10 op fatal("getnameinfo: %s", gai_strerror(ec));
112 709d6e5e 2021-01-10 op if (vasprintf(&fmted, fmt, ap) == -1)
113 709d6e5e 2021-01-10 op fatal("vasprintf: %s", strerror(errno));
115 709d6e5e 2021-01-10 op if (foreground)
116 709d6e5e 2021-01-10 op fprintf(stderr, "%s:%s %s\n", hbuf, sbuf, fmted);
118 709d6e5e 2021-01-10 op if (asprintf(&s, "%s:%s %s", hbuf, sbuf, fmted) == -1)
119 709d6e5e 2021-01-10 op fatal("asprintf: %s", strerror(errno));
120 709d6e5e 2021-01-10 op syslog(priority | LOG_DAEMON, "%s", s);
130 4a28dd01 2020-12-28 op sig_handler(int sig)
136 72f653b6 2020-11-06 op starts_with(const char *str, const char *prefix)
140 72f653b6 2020-11-06 op for (i = 0; prefix[i] != '\0'; ++i)
141 72f653b6 2020-11-06 op if (str[i] != prefix[i])
147 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
149 3e4749f7 2020-10-02 op char buf[1030] = {0}; /* status + ' ' + max reply len + \r\n\0 */
153 592fd624 2020-10-07 op client->code = code;
154 592fd624 2020-10-07 op client->meta = reason;
155 592fd624 2020-10-07 op client->state = S_INITIALIZING;
157 3e4749f7 2020-10-02 op len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
158 3e4749f7 2020-10-02 op assert(len < (int)sizeof(buf));
159 592fd624 2020-10-07 op ret = tls_write(client->ctx, buf, len);
160 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
161 592fd624 2020-10-07 op pfd->events = POLLIN;
165 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
166 592fd624 2020-10-07 op pfd->events = POLLOUT;
174 f28f9311 2020-10-14 op filesize(int fd)
178 f28f9311 2020-10-14 op if ((len = lseek(fd, 0, SEEK_END)) == -1)
180 f28f9311 2020-10-14 op if (lseek(fd, 0, SEEK_SET) == -1)
186 cc68fe70 2020-10-07 op path_ext(const char *path)
188 cc68fe70 2020-10-07 op const char *end;
190 cc68fe70 2020-10-07 op end = path + strlen(path)-1; /* the last byte before the NUL */
191 cc68fe70 2020-10-07 op for (; end != path; --end) {
192 cc68fe70 2020-10-07 op if (*end == '.')
193 cc68fe70 2020-10-07 op return end+1;
194 cc68fe70 2020-10-07 op if (*end == '/')
202 cc68fe70 2020-10-07 op mime(const char *path)
204 cc68fe70 2020-10-07 op const char *ext, *def = "application/octet-stream";
205 cc68fe70 2020-10-07 op struct etm *t;
207 cc68fe70 2020-10-07 op if ((ext = path_ext(path)) == NULL)
210 cc68fe70 2020-10-07 op for (t = filetypes; t->mime != NULL; ++t)
211 cc68fe70 2020-10-07 op if (!strcmp(ext, t->ext))
212 cc68fe70 2020-10-07 op return t->mime;
218 d7802bb4 2020-12-02 op check_path(struct client *c, const char *path, int *fd)
220 72342dc9 2020-11-06 op struct stat sb;
222 f28f9311 2020-10-14 op assert(path != NULL);
223 33d32d1f 2020-12-25 op if ((*fd = openat(dirfd, *path ? path : ".",
224 a5d310bc 2020-11-10 op O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
225 a5d310bc 2020-11-10 op return FILE_MISSING;
228 a5d310bc 2020-11-10 op if (fstat(*fd, &sb) == -1) {
229 d7802bb4 2020-12-02 op LOGN(c, "failed stat for %s: %s", path, strerror(errno));
230 a5d310bc 2020-11-10 op return FILE_MISSING;
233 a5d310bc 2020-11-10 op if (S_ISDIR(sb.st_mode))
234 a5d310bc 2020-11-10 op return FILE_DIRECTORY;
236 a5d310bc 2020-11-10 op if (sb.st_mode & S_IXUSR)
237 a5d310bc 2020-11-10 op return FILE_EXECUTABLE;
239 a5d310bc 2020-11-10 op return FILE_EXISTS;
243 a5d310bc 2020-11-10 op * the inverse of this algorithm, i.e. starting from the start of the
244 a5d310bc 2020-11-10 op * path + strlen(cgi), and checking if each component, should be
245 a5d310bc 2020-11-10 op * faster. But it's tedious to write. This does the opposite: starts
246 a5d310bc 2020-11-10 op * from the end and strip one component at a time, until either an
247 a5d310bc 2020-11-10 op * executable is found or we emptied the path.
250 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
253 a5d310bc 2020-11-10 op end = strchr(path, '\0');
255 a5d310bc 2020-11-10 op /* NB: assume CGI is enabled and path matches cgi */
257 a5d310bc 2020-11-10 op while (end > path) {
258 a5d310bc 2020-11-10 op /* go up one level. UNIX paths are simple and POSIX
259 a5d310bc 2020-11-10 op * dirname, with its ambiguities on if the given path
260 a5d310bc 2020-11-10 op * is changed or not, gives me headaches. */
261 a5d310bc 2020-11-10 op while (*end != '/')
265 d7802bb4 2020-12-02 op switch (check_path(c, path, &c->fd)) {
266 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
267 a5d310bc 2020-11-10 op return start_cgi(path, end+1, query, fds,c);
268 a5d310bc 2020-11-10 op case FILE_MISSING:
279 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
281 a5d310bc 2020-11-10 op goodbye(fds, c);
287 33d32d1f 2020-12-25 op open_file(char *fpath, char *query, struct pollfd *fds, struct client *c)
289 d7802bb4 2020-12-02 op switch (check_path(c, fpath, &c->fd)) {
290 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
291 5a40216f 2020-12-28 op if (cgi != NULL && starts_with(fpath, cgi))
292 a5d310bc 2020-11-10 op return start_cgi(fpath, "", query, fds, c);
294 a5d310bc 2020-11-10 op /* fallthrough */
296 a5d310bc 2020-11-10 op case FILE_EXISTS:
297 a5d310bc 2020-11-10 op if ((c->len = filesize(c->fd)) == -1) {
298 d7802bb4 2020-12-02 op LOGE(c, "failed to get file size for %s", fpath);
299 a5d310bc 2020-11-10 op goodbye(fds, c);
303 a5d310bc 2020-11-10 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
304 a5d310bc 2020-11-10 op c->fd, 0)) == MAP_FAILED) {
305 a5d310bc 2020-11-10 op warn("mmap: %s", fpath);
306 a5d310bc 2020-11-10 op goodbye(fds, c);
309 a5d310bc 2020-11-10 op c->i = c->buf;
310 a5d310bc 2020-11-10 op return start_reply(fds, c, SUCCESS, mime(fpath));
312 a5d310bc 2020-11-10 op case FILE_DIRECTORY:
313 d7802bb4 2020-12-02 op LOGD(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
314 f28f9311 2020-10-14 op close(c->fd);
316 f28f9311 2020-10-14 op send_dir(fpath, fds, c);
319 a5d310bc 2020-11-10 op case FILE_MISSING:
320 5a40216f 2020-12-28 op if (cgi != NULL && starts_with(fpath, cgi))
321 a5d310bc 2020-11-10 op return check_for_cgi(fpath, query, fds, c);
323 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
325 f28f9311 2020-10-14 op goodbye(fds, c);
329 a5d310bc 2020-11-10 op /* unreachable */
335 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
336 75d233f0 2020-11-06 op struct pollfd *fds, struct client *c)
339 a5d310bc 2020-11-10 op int p[2]; /* read end, write end */
341 72342dc9 2020-11-06 op if (pipe(p) == -1)
344 72342dc9 2020-11-06 op switch (pid = fork()) {
348 a5d310bc 2020-11-10 op case 0: { /* child */
349 721e2325 2020-11-18 op char *ex, *requri, *portno;
350 85dff1f9 2021-01-11 op char addr[NI_MAXHOST];
351 72342dc9 2020-11-06 op char *argv[] = { NULL, NULL, NULL };
355 72342dc9 2020-11-06 op if (dup2(p[1], 1) == -1)
356 72342dc9 2020-11-06 op goto childerr;
358 72342dc9 2020-11-06 op if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
359 a5d310bc 2020-11-10 op goto childerr;
361 85dff1f9 2021-01-11 op ec = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
362 85dff1f9 2021-01-11 op addr, sizeof(addr),
364 85dff1f9 2021-01-11 op NI_NUMERICHOST | NI_NUMERICSERV);
366 85dff1f9 2021-01-11 op goto childerr;
368 721e2325 2020-11-18 op if (asprintf(&portno, "%d", port) == -1)
369 721e2325 2020-11-18 op goto childerr;
371 5a40216f 2020-12-28 op if (asprintf(&ex, "%s/%s", dir, spath) == -1)
372 72342dc9 2020-11-06 op goto childerr;
374 a5d310bc 2020-11-10 op if (asprintf(&requri, "%s%s%s", spath,
375 a5d310bc 2020-11-10 op *relpath == '\0' ? "" : "/",
376 a5d310bc 2020-11-10 op relpath) == -1)
377 a5d310bc 2020-11-10 op goto childerr;
379 a5d310bc 2020-11-10 op argv[0] = argv[1] = ex;
381 60ba426e 2020-11-06 op /* fix the env */
382 9b374f41 2021-01-10 op safe_setenv("GATEWAY_INTERFACE", "CGI/1.1");
383 9b374f41 2021-01-10 op safe_setenv("SERVER_SOFTWARE", "gmid");
384 9b374f41 2021-01-10 op safe_setenv("SERVER_PORT", portno);
385 a5d310bc 2020-11-10 op /* setenv("SERVER_NAME", "", 1); */
386 9b374f41 2021-01-10 op safe_setenv("SCRIPT_NAME", spath);
387 9b374f41 2021-01-10 op safe_setenv("SCRIPT_EXECUTABLE", ex);
388 9b374f41 2021-01-10 op safe_setenv("REQUEST_URI", requri);
389 9b374f41 2021-01-10 op safe_setenv("REQUEST_RELATIVE", relpath);
390 9b374f41 2021-01-10 op safe_setenv("QUERY_STRING", query);
391 9b374f41 2021-01-10 op safe_setenv("REMOTE_HOST", addr);
392 9b374f41 2021-01-10 op safe_setenv("REMOTE_ADDR", addr);
393 9b374f41 2021-01-10 op safe_setenv("DOCUMENT_ROOT", dir);
395 677afbd3 2020-12-02 op if (tls_peer_cert_provided(c->ctx)) {
396 9b374f41 2021-01-10 op safe_setenv("AUTH_TYPE", "Certificate");
397 9b374f41 2021-01-10 op safe_setenv("REMOTE_USER", tls_peer_cert_subject(c->ctx));
398 9b374f41 2021-01-10 op safe_setenv("TLS_CLIENT_ISSUER", tls_peer_cert_issuer(c->ctx));
399 9b374f41 2021-01-10 op safe_setenv("TLS_CLIENT_HASH", tls_peer_cert_hash(c->ctx));
402 a5d310bc 2020-11-10 op execvp(ex, argv);
403 72342dc9 2020-11-06 op goto childerr;
406 72342dc9 2020-11-06 op default: /* parent */
408 72342dc9 2020-11-06 op close(c->fd);
409 72342dc9 2020-11-06 op c->fd = p[0];
410 72342dc9 2020-11-06 op c->child = pid;
411 aff8d190 2020-11-06 op mark_nonblock(c->fd);
412 aff8d190 2020-11-06 op c->state = S_SENDING;
413 72342dc9 2020-11-06 op handle_cgi(fds, c);
418 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
420 72342dc9 2020-11-06 op goodbye(fds, c);
424 72342dc9 2020-11-06 op dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
430 6c6c7a0e 2020-12-28 op cgi_poll_on_child(struct pollfd *fds, struct client *c)
434 aff8d190 2020-11-06 op if (c->waiting_on_child)
436 aff8d190 2020-11-06 op c->waiting_on_child = 1;
438 aff8d190 2020-11-06 op fds->events = POLLIN;
440 aff8d190 2020-11-06 op fd = fds->fd;
441 aff8d190 2020-11-06 op fds->fd = c->fd;
446 6c6c7a0e 2020-12-28 op cgi_poll_on_client(struct pollfd *fds, struct client *c)
450 aff8d190 2020-11-06 op if (!c->waiting_on_child)
452 aff8d190 2020-11-06 op c->waiting_on_child = 0;
454 aff8d190 2020-11-06 op fd = fds->fd;
455 aff8d190 2020-11-06 op fds->fd = c->fd;
460 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
464 aff8d190 2020-11-06 op /* ensure c->fd is the child and fds->fd the client */
465 6c6c7a0e 2020-12-28 op cgi_poll_on_client(fds, c);
468 aff8d190 2020-11-06 op if (c->len == 0) {
469 aff8d190 2020-11-06 op if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
471 aff8d190 2020-11-06 op if (r == -1) {
472 aff8d190 2020-11-06 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
473 6c6c7a0e 2020-12-28 op cgi_poll_on_child(fds, c);
482 aff8d190 2020-11-06 op while (c->len > 0) {
483 aff8d190 2020-11-06 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
487 72342dc9 2020-11-06 op case TLS_WANT_POLLOUT:
488 aff8d190 2020-11-06 op fds->events = POLLOUT;
491 72342dc9 2020-11-06 op case TLS_WANT_POLLIN:
492 aff8d190 2020-11-06 op fds->events = POLLIN;
504 72342dc9 2020-11-06 op goodbye(fds, c);
508 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
510 f28f9311 2020-10-14 op ssize_t ret, len;
512 f28f9311 2020-10-14 op if (c->fd == -1) {
513 75d233f0 2020-11-06 op if (!open_file(path, query, fds, c))
515 f28f9311 2020-10-14 op c->state = S_SENDING;
518 f28f9311 2020-10-14 op len = (c->buf + c->len) - c->i;
520 f28f9311 2020-10-14 op while (len > 0) {
521 f28f9311 2020-10-14 op switch (ret = tls_write(c->ctx, c->i, len)) {
523 d7802bb4 2020-12-02 op LOGE(c, "tls_write: %s", tls_error(c->ctx));
524 f28f9311 2020-10-14 op goodbye(fds, c);
527 f28f9311 2020-10-14 op case TLS_WANT_POLLIN:
528 f28f9311 2020-10-14 op fds->events = POLLIN;
531 f28f9311 2020-10-14 op case TLS_WANT_POLLOUT:
532 f28f9311 2020-10-14 op fds->events = POLLOUT;
542 f28f9311 2020-10-14 op goodbye(fds, c);
546 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
548 3e4749f7 2020-10-02 op char fpath[PATHBUF];
551 3e4749f7 2020-10-02 op bzero(fpath, PATHBUF);
553 9c56b0a7 2020-10-14 op if (path[0] != '.')
554 3e4749f7 2020-10-02 op fpath[0] = '.';
556 3e4749f7 2020-10-02 op /* this cannot fail since sizeof(fpath) > maxlen of path */
557 3e4749f7 2020-10-02 op strlcat(fpath, path, PATHBUF);
558 3e4749f7 2020-10-02 op len = strlen(fpath);
560 3e4749f7 2020-10-02 op /* add a trailing / in case. */
561 3e4749f7 2020-10-02 op if (fpath[len-1] != '/') {
562 3e4749f7 2020-10-02 op fpath[len] = '/';
565 3e4749f7 2020-10-02 op strlcat(fpath, "index.gmi", sizeof(fpath));
567 75d233f0 2020-11-06 op send_file(fpath, NULL, fds, client);
571 592fd624 2020-10-07 op handle(struct pollfd *fds, struct client *client)
573 592fd624 2020-10-07 op char buf[GEMINI_URL_LEN];
574 33d32d1f 2020-12-25 op const char *parse_err;
575 3c1cf9d0 2021-01-11 op struct iri iri;
577 592fd624 2020-10-07 op switch (client->state) {
579 592fd624 2020-10-07 op bzero(buf, GEMINI_URL_LEN);
580 592fd624 2020-10-07 op switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
582 d7802bb4 2020-12-02 op LOGE(client, "tls_read: %s", tls_error(client->ctx));
583 592fd624 2020-10-07 op goodbye(fds, client);
586 592fd624 2020-10-07 op case TLS_WANT_POLLIN:
587 592fd624 2020-10-07 op fds->events = POLLIN;
590 592fd624 2020-10-07 op case TLS_WANT_POLLOUT:
591 592fd624 2020-10-07 op fds->events = POLLOUT;
595 b3deee7b 2020-12-28 op parse_err = "invalid request";
596 3c1cf9d0 2021-01-11 op if (!trim_req_iri(buf) || !parse_iri(buf, &iri, &parse_err)) {
597 33d32d1f 2020-12-25 op if (!start_reply(fds, client, BAD_REQUEST, parse_err))
599 592fd624 2020-10-07 op goodbye(fds, client);
603 33d32d1f 2020-12-25 op LOGI(client, "GET %s%s%s",
604 3c1cf9d0 2021-01-11 op *iri.path ? iri.path : "/",
605 3c1cf9d0 2021-01-11 op *iri.query ? "?" : "",
606 3c1cf9d0 2021-01-11 op *iri.query ? iri.query : "");
608 3c1cf9d0 2021-01-11 op send_file(iri.path, iri.query, fds, client);
611 592fd624 2020-10-07 op case S_INITIALIZING:
612 592fd624 2020-10-07 op if (!start_reply(fds, client, client->code, client->meta))
615 592fd624 2020-10-07 op if (client->code != SUCCESS) {
616 592fd624 2020-10-07 op /* we don't need a body */
617 592fd624 2020-10-07 op goodbye(fds, client);
621 592fd624 2020-10-07 op client->state = S_SENDING;
623 592fd624 2020-10-07 op /* fallthrough */
625 592fd624 2020-10-07 op case S_SENDING:
626 aff8d190 2020-11-06 op if (client->child != -1)
627 aff8d190 2020-11-06 op handle_cgi(fds, client);
629 aff8d190 2020-11-06 op send_file(NULL, NULL, fds, client);
632 592fd624 2020-10-07 op case S_CLOSING:
633 592fd624 2020-10-07 op goodbye(fds, client);
637 592fd624 2020-10-07 op /* unreachable */
643 592fd624 2020-10-07 op mark_nonblock(int fd)
647 592fd624 2020-10-07 op if ((flags = fcntl(fd, F_GETFL)) == -1)
648 80bbcad5 2021-01-10 op fatal("fcntl(F_GETFL): %s", strerror(errno));
649 592fd624 2020-10-07 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
650 80bbcad5 2021-01-10 op fatal("fcntl(F_SETFL): %s", strerror(errno));
654 9468027b 2020-10-15 op make_socket(int port, int family)
657 9468027b 2020-10-15 op struct sockaddr_in addr4;
658 9468027b 2020-10-15 op struct sockaddr_in6 addr6;
659 9468027b 2020-10-15 op struct sockaddr *addr;
660 9468027b 2020-10-15 op socklen_t len;
662 9468027b 2020-10-15 op switch (family) {
663 9468027b 2020-10-15 op case AF_INET:
664 9468027b 2020-10-15 op bzero(&addr4, sizeof(addr4));
665 9468027b 2020-10-15 op addr4.sin_family = family;
666 9468027b 2020-10-15 op addr4.sin_port = htons(port);
667 9468027b 2020-10-15 op addr4.sin_addr.s_addr = INADDR_ANY;
668 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr4;
669 9468027b 2020-10-15 op len = sizeof(addr4);
672 9468027b 2020-10-15 op case AF_INET6:
673 9468027b 2020-10-15 op bzero(&addr6, sizeof(addr6));
674 9468027b 2020-10-15 op addr6.sin6_family = AF_INET6;
675 9468027b 2020-10-15 op addr6.sin6_port = htons(port);
676 9468027b 2020-10-15 op addr6.sin6_addr = in6addr_any;
677 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr6;
678 9468027b 2020-10-15 op len = sizeof(addr6);
682 9468027b 2020-10-15 op /* unreachable */
686 9468027b 2020-10-15 op if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
687 80bbcad5 2021-01-10 op fatal("socket: %s", strerror(errno));
690 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
691 80bbcad5 2021-01-10 op fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
694 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
695 80bbcad5 2021-01-10 op fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
697 592fd624 2020-10-07 op mark_nonblock(sock);
699 9468027b 2020-10-15 op if (bind(sock, addr, len) == -1)
700 80bbcad5 2021-01-10 op fatal("bind: %s", strerror(errno));
702 3e4749f7 2020-10-02 op if (listen(sock, 16) == -1)
703 80bbcad5 2021-01-10 op fatal("listen: %s", strerror(errno));
709 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
712 709d6e5e 2021-01-10 op struct sockaddr_storage addr;
713 3e4749f7 2020-10-02 op socklen_t len;
715 592fd624 2020-10-07 op len = sizeof(addr);
716 592fd624 2020-10-07 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
717 592fd624 2020-10-07 op if (errno == EWOULDBLOCK)
719 80bbcad5 2021-01-10 op fatal("accept: %s", strerror(errno));
722 592fd624 2020-10-07 op mark_nonblock(fd);
724 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
725 592fd624 2020-10-07 op if (fds[i].fd == -1) {
726 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
727 592fd624 2020-10-07 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
728 592fd624 2020-10-07 op break; /* goodbye fd! */
730 592fd624 2020-10-07 op fds[i].fd = fd;
731 592fd624 2020-10-07 op fds[i].events = POLLIN;
733 592fd624 2020-10-07 op clients[i].state = S_OPEN;
734 592fd624 2020-10-07 op clients[i].fd = -1;
735 72342dc9 2020-11-06 op clients[i].child = -1;
736 f28f9311 2020-10-14 op clients[i].buf = MAP_FAILED;
737 2c3a40fa 2020-11-06 op clients[i].af = AF_INET;
738 709d6e5e 2021-01-10 op clients[i].addr = addr;
740 120381c9 2020-11-06 op connected_clients++;
749 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
753 592fd624 2020-10-07 op c->state = S_CLOSING;
755 592fd624 2020-10-07 op ret = tls_close(c->ctx);
756 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
757 592fd624 2020-10-07 op pfd->events = POLLIN;
760 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
761 592fd624 2020-10-07 op pfd->events = POLLOUT;
765 120381c9 2020-11-06 op connected_clients--;
767 592fd624 2020-10-07 op tls_free(c->ctx);
768 592fd624 2020-10-07 op c->ctx = NULL;
770 f28f9311 2020-10-14 op if (c->buf != MAP_FAILED)
771 f28f9311 2020-10-14 op munmap(c->buf, c->len);
773 592fd624 2020-10-07 op if (c->fd != -1)
774 592fd624 2020-10-07 op close(c->fd);
776 592fd624 2020-10-07 op close(pfd->fd);
777 592fd624 2020-10-07 op pfd->fd = -1;
781 33756bd2 2021-01-10 op loop(struct tls *ctx, int sock4, int sock6)
784 592fd624 2020-10-07 op struct client clients[MAX_USERS];
785 592fd624 2020-10-07 op struct pollfd fds[MAX_USERS];
787 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
788 592fd624 2020-10-07 op fds[i].fd = -1;
789 592fd624 2020-10-07 op fds[i].events = POLLIN;
790 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
793 33756bd2 2021-01-10 op fds[0].fd = sock4;
794 33756bd2 2021-01-10 op fds[1].fd = sock6;
797 16ace04d 2021-01-08 op if (poll(fds, MAX_USERS, INFTIM) == -1) {
798 120381c9 2020-11-06 op if (errno == EINTR) {
799 d7802bb4 2020-12-02 op warnx("connected clients: %d",
800 d7802bb4 2020-12-02 op connected_clients);
803 80bbcad5 2021-01-10 op fatal("poll: %s", strerror(errno));
806 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; i++) {
807 592fd624 2020-10-07 op if (fds[i].revents == 0)
810 592fd624 2020-10-07 op if (fds[i].revents & (POLLERR|POLLNVAL))
811 80bbcad5 2021-01-10 op fatal("bad fd %d: %s", fds[i].fd,
812 d7802bb4 2020-12-02 op strerror(errno));
814 592fd624 2020-10-07 op if (fds[i].revents & POLLHUP) {
815 aff8d190 2020-11-06 op /* fds[i] may be the fd of the stdin
816 aff8d190 2020-11-06 op * of a cgi script that has exited. */
817 aff8d190 2020-11-06 op if (!clients[i].waiting_on_child) {
818 aff8d190 2020-11-06 op goodbye(&fds[i], &clients[i]);
823 33756bd2 2021-01-10 op if (fds[i].fd == sock4)
824 33756bd2 2021-01-10 op do_accept(sock4, ctx, fds, clients);
825 33756bd2 2021-01-10 op else if (fds[i].fd == sock6)
826 33756bd2 2021-01-10 op do_accept(sock6, ctx, fds, clients);
828 33756bd2 2021-01-10 op handle(&fds[i], &clients[i]);
834 231bfcdc 2020-12-21 op absolutify_path(const char *path)
836 231bfcdc 2020-12-21 op char *wd, *r;
838 231bfcdc 2020-12-21 op if (*path == '/')
839 231bfcdc 2020-12-21 op return strdup(path);
841 231bfcdc 2020-12-21 op wd = getwd(NULL);
842 231bfcdc 2020-12-21 op if (asprintf(&r, "%s/%s", wd, path) == -1)
843 231bfcdc 2020-12-21 op err(1, "asprintf");
849 3e4749f7 2020-10-02 op usage(const char *me)
851 3e4749f7 2020-10-02 op fprintf(stderr,
852 72f653b6 2020-11-06 op "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem] "
853 721e2325 2020-11-18 op "[-l logfile] [-p port] [-x cgi-bin]\n",
858 3e4749f7 2020-10-02 op main(int argc, char **argv)
860 72342dc9 2020-11-06 op const char *cert = "cert.pem", *key = "key.pem";
861 3e4749f7 2020-10-02 op struct tls *ctx = NULL;
862 3e4749f7 2020-10-02 op struct tls_config *conf;
863 85dff1f9 2021-01-11 op int sock4, sock6, enable_ipv6, ch;
864 120381c9 2020-11-06 op connected_clients = 0;
866 51d876f0 2020-12-21 op if ((dir = absolutify_path("docs")) == NULL)
867 51d876f0 2020-12-21 op err(1, "absolutify_path");
871 d7802bb4 2020-12-02 op foreground = 0;
872 85dff1f9 2021-01-11 op enable_ipv6 = 0;
874 85dff1f9 2021-01-11 op while ((ch = getopt(argc, argv, "6c:d:fhk:p:x:")) != -1) {
875 3e4749f7 2020-10-02 op switch (ch) {
877 85dff1f9 2021-01-11 op enable_ipv6 = 1;
881 3e4749f7 2020-10-02 op cert = optarg;
885 231bfcdc 2020-12-21 op free((char*)dir);
886 231bfcdc 2020-12-21 op if ((dir = absolutify_path(optarg)) == NULL)
887 231bfcdc 2020-12-21 op err(1, "absolutify_path");
891 d7802bb4 2020-12-02 op foreground = 1;
895 3e4749f7 2020-10-02 op usage(*argv);
899 3e4749f7 2020-10-02 op key = optarg;
907 721e2325 2020-11-18 op lval = strtol(optarg, &ep, 10);
908 721e2325 2020-11-18 op if (optarg[0] == '\0' || *ep != '\0')
909 721e2325 2020-11-18 op err(1, "not a number: %s", optarg);
910 721e2325 2020-11-18 op if (lval < 0 || lval > UINT16_MAX)
911 721e2325 2020-11-18 op err(1, "port number out of range: %s", optarg);
917 72f653b6 2020-11-06 op cgi = optarg;
921 3e4749f7 2020-10-02 op usage(*argv);
926 4a28dd01 2020-12-28 op signal(SIGPIPE, SIG_IGN);
927 4a28dd01 2020-12-28 op signal(SIGCHLD, SIG_IGN);
929 4a28dd01 2020-12-28 op #ifdef SIGINFO
930 4a28dd01 2020-12-28 op signal(SIGINFO, sig_handler);
932 4a28dd01 2020-12-28 op signal(SIGUSR2, sig_handler);
934 4a28dd01 2020-12-28 op if (!foreground)
935 4a28dd01 2020-12-28 op signal(SIGHUP, SIG_IGN);
937 3e4749f7 2020-10-02 op if ((conf = tls_config_new()) == NULL)
938 3e4749f7 2020-10-02 op err(1, "tls_config_new");
940 677afbd3 2020-12-02 op /* optionally accept client certs, but don't try to verify them */
941 677afbd3 2020-12-02 op tls_config_verify_client_optional(conf);
942 677afbd3 2020-12-02 op tls_config_insecure_noverifycert(conf);
944 0d8ca45a 2020-10-03 op if (tls_config_set_protocols(conf,
945 0d8ca45a 2020-10-03 op TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
946 0d8ca45a 2020-10-03 op err(1, "tls_config_set_protocols");
948 4d4f0e19 2020-10-03 op if (tls_config_set_cert_file(conf, cert) == -1)
949 4d4f0e19 2020-10-03 op err(1, "tls_config_set_cert_file: %s", cert);
951 4d4f0e19 2020-10-03 op if (tls_config_set_key_file(conf, key) == -1)
952 4d4f0e19 2020-10-03 op err(1, "tls_config_set_key_file: %s", key);
954 3e4749f7 2020-10-02 op if ((ctx = tls_server()) == NULL)
955 3e4749f7 2020-10-02 op err(1, "tls_server");
957 3e4749f7 2020-10-02 op if (tls_configure(ctx, conf) == -1)
958 3e4749f7 2020-10-02 op errx(1, "tls_configure: %s", tls_error(ctx));
960 33756bd2 2021-01-10 op sock4 = make_socket(port, AF_INET);
961 85dff1f9 2021-01-11 op if (enable_ipv6)
962 85dff1f9 2021-01-11 op sock6 = make_socket(port, AF_INET6);
966 3e4749f7 2020-10-02 op if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
967 3e4749f7 2020-10-02 op err(1, "open: %s", dir);
969 d7802bb4 2020-12-02 op if (!foreground && daemon(0, 1) == -1)
972 4c416739 2020-01-01 op if (unveil(dir, "rx") == -1)
973 4c416739 2020-01-01 op err(1, "unveil");
975 4c416739 2020-01-01 op if (pledge("stdio rpath inet proc exec", NULL) == -1)
976 4c416739 2020-01-01 op err(1, "pledge");
978 4c416739 2020-01-01 op /* drop proc and exec if cgi isn't enabled */
979 4c416739 2020-01-01 op if (cgi == NULL && pledge("stdio rpath inet", NULL) == -1)
980 4c416739 2020-01-01 op err(1, "pledge");
982 33756bd2 2021-01-10 op loop(ctx, sock4, sock6);
984 33756bd2 2021-01-10 op close(sock4);
985 33756bd2 2021-01-10 op close(sock6);
986 3e4749f7 2020-10-02 op tls_free(ctx);
987 3e4749f7 2020-10-02 op tls_config_free(conf);