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/socket.h>
19 3e4749f7 2020-10-02 op #include <sys/stat.h>
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 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 80bbcad5 2021-01-10 op logs(int priority, struct client *c, const char *fmt, ...)
95 80bbcad5 2021-01-10 op char buf[INET_ADDRSTRLEN];
98 80bbcad5 2021-01-10 op va_start(ap, fmt);
99 80bbcad5 2021-01-10 op priority |= LOG_DAEMON;
101 80bbcad5 2021-01-10 op if (inet_ntop(c->af, &c->addr, buf, sizeof(buf)) == NULL)
102 80bbcad5 2021-01-10 op fatal("inet_ntop: %s", strerror(errno));
104 80bbcad5 2021-01-10 op if (foreground) {
105 80bbcad5 2021-01-10 op vfprintf(stderr, fmt, ap);
106 80bbcad5 2021-01-10 op fprintf(stderr, "\n");
108 80bbcad5 2021-01-10 op vsyslog(priority, fmt, ap);
114 4a28dd01 2020-12-28 op sig_handler(int sig)
120 72f653b6 2020-11-06 op starts_with(const char *str, const char *prefix)
124 72f653b6 2020-11-06 op for (i = 0; prefix[i] != '\0'; ++i)
125 72f653b6 2020-11-06 op if (str[i] != prefix[i])
131 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
133 3e4749f7 2020-10-02 op char buf[1030] = {0}; /* status + ' ' + max reply len + \r\n\0 */
137 592fd624 2020-10-07 op client->code = code;
138 592fd624 2020-10-07 op client->meta = reason;
139 592fd624 2020-10-07 op client->state = S_INITIALIZING;
141 3e4749f7 2020-10-02 op len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
142 3e4749f7 2020-10-02 op assert(len < (int)sizeof(buf));
143 592fd624 2020-10-07 op ret = tls_write(client->ctx, buf, len);
144 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
145 592fd624 2020-10-07 op pfd->events = POLLIN;
149 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
150 592fd624 2020-10-07 op pfd->events = POLLOUT;
158 f28f9311 2020-10-14 op filesize(int fd)
162 f28f9311 2020-10-14 op if ((len = lseek(fd, 0, SEEK_END)) == -1)
164 f28f9311 2020-10-14 op if (lseek(fd, 0, SEEK_SET) == -1)
170 cc68fe70 2020-10-07 op path_ext(const char *path)
172 cc68fe70 2020-10-07 op const char *end;
174 cc68fe70 2020-10-07 op end = path + strlen(path)-1; /* the last byte before the NUL */
175 cc68fe70 2020-10-07 op for (; end != path; --end) {
176 cc68fe70 2020-10-07 op if (*end == '.')
177 cc68fe70 2020-10-07 op return end+1;
178 cc68fe70 2020-10-07 op if (*end == '/')
186 cc68fe70 2020-10-07 op mime(const char *path)
188 cc68fe70 2020-10-07 op const char *ext, *def = "application/octet-stream";
189 cc68fe70 2020-10-07 op struct etm *t;
191 cc68fe70 2020-10-07 op if ((ext = path_ext(path)) == NULL)
194 cc68fe70 2020-10-07 op for (t = filetypes; t->mime != NULL; ++t)
195 cc68fe70 2020-10-07 op if (!strcmp(ext, t->ext))
196 cc68fe70 2020-10-07 op return t->mime;
202 d7802bb4 2020-12-02 op check_path(struct client *c, const char *path, int *fd)
204 72342dc9 2020-11-06 op struct stat sb;
206 f28f9311 2020-10-14 op assert(path != NULL);
207 33d32d1f 2020-12-25 op if ((*fd = openat(dirfd, *path ? path : ".",
208 a5d310bc 2020-11-10 op O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
209 a5d310bc 2020-11-10 op return FILE_MISSING;
212 a5d310bc 2020-11-10 op if (fstat(*fd, &sb) == -1) {
213 d7802bb4 2020-12-02 op LOGN(c, "failed stat for %s: %s", path, strerror(errno));
214 a5d310bc 2020-11-10 op return FILE_MISSING;
217 a5d310bc 2020-11-10 op if (S_ISDIR(sb.st_mode))
218 a5d310bc 2020-11-10 op return FILE_DIRECTORY;
220 a5d310bc 2020-11-10 op if (sb.st_mode & S_IXUSR)
221 a5d310bc 2020-11-10 op return FILE_EXECUTABLE;
223 a5d310bc 2020-11-10 op return FILE_EXISTS;
227 a5d310bc 2020-11-10 op * the inverse of this algorithm, i.e. starting from the start of the
228 a5d310bc 2020-11-10 op * path + strlen(cgi), and checking if each component, should be
229 a5d310bc 2020-11-10 op * faster. But it's tedious to write. This does the opposite: starts
230 a5d310bc 2020-11-10 op * from the end and strip one component at a time, until either an
231 a5d310bc 2020-11-10 op * executable is found or we emptied the path.
234 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
237 a5d310bc 2020-11-10 op end = strchr(path, '\0');
239 a5d310bc 2020-11-10 op /* NB: assume CGI is enabled and path matches cgi */
241 a5d310bc 2020-11-10 op while (end > path) {
242 a5d310bc 2020-11-10 op /* go up one level. UNIX paths are simple and POSIX
243 a5d310bc 2020-11-10 op * dirname, with its ambiguities on if the given path
244 a5d310bc 2020-11-10 op * is changed or not, gives me headaches. */
245 a5d310bc 2020-11-10 op while (*end != '/')
249 d7802bb4 2020-12-02 op switch (check_path(c, path, &c->fd)) {
250 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
251 a5d310bc 2020-11-10 op return start_cgi(path, end+1, query, fds,c);
252 a5d310bc 2020-11-10 op case FILE_MISSING:
263 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
265 a5d310bc 2020-11-10 op goodbye(fds, c);
271 33d32d1f 2020-12-25 op open_file(char *fpath, char *query, struct pollfd *fds, struct client *c)
273 d7802bb4 2020-12-02 op switch (check_path(c, fpath, &c->fd)) {
274 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
275 5a40216f 2020-12-28 op if (cgi != NULL && starts_with(fpath, cgi))
276 a5d310bc 2020-11-10 op return start_cgi(fpath, "", query, fds, c);
278 a5d310bc 2020-11-10 op /* fallthrough */
280 a5d310bc 2020-11-10 op case FILE_EXISTS:
281 a5d310bc 2020-11-10 op if ((c->len = filesize(c->fd)) == -1) {
282 d7802bb4 2020-12-02 op LOGE(c, "failed to get file size for %s", fpath);
283 a5d310bc 2020-11-10 op goodbye(fds, c);
287 a5d310bc 2020-11-10 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
288 a5d310bc 2020-11-10 op c->fd, 0)) == MAP_FAILED) {
289 a5d310bc 2020-11-10 op warn("mmap: %s", fpath);
290 a5d310bc 2020-11-10 op goodbye(fds, c);
293 a5d310bc 2020-11-10 op c->i = c->buf;
294 a5d310bc 2020-11-10 op return start_reply(fds, c, SUCCESS, mime(fpath));
296 a5d310bc 2020-11-10 op case FILE_DIRECTORY:
297 d7802bb4 2020-12-02 op LOGD(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
298 f28f9311 2020-10-14 op close(c->fd);
300 f28f9311 2020-10-14 op send_dir(fpath, fds, c);
303 a5d310bc 2020-11-10 op case FILE_MISSING:
304 5a40216f 2020-12-28 op if (cgi != NULL && starts_with(fpath, cgi))
305 a5d310bc 2020-11-10 op return check_for_cgi(fpath, query, fds, c);
307 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
309 f28f9311 2020-10-14 op goodbye(fds, c);
313 a5d310bc 2020-11-10 op /* unreachable */
319 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
320 75d233f0 2020-11-06 op struct pollfd *fds, struct client *c)
323 a5d310bc 2020-11-10 op int p[2]; /* read end, write end */
325 72342dc9 2020-11-06 op if (pipe(p) == -1)
328 72342dc9 2020-11-06 op switch (pid = fork()) {
332 a5d310bc 2020-11-10 op case 0: { /* child */
333 721e2325 2020-11-18 op char *ex, *requri, *portno;
334 72342dc9 2020-11-06 op char addr[INET_ADDRSTRLEN];
335 72342dc9 2020-11-06 op char *argv[] = { NULL, NULL, NULL };
338 72342dc9 2020-11-06 op if (dup2(p[1], 1) == -1)
339 72342dc9 2020-11-06 op goto childerr;
341 72342dc9 2020-11-06 op if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
342 a5d310bc 2020-11-10 op goto childerr;
344 721e2325 2020-11-18 op if (asprintf(&portno, "%d", port) == -1)
345 721e2325 2020-11-18 op goto childerr;
347 5a40216f 2020-12-28 op if (asprintf(&ex, "%s/%s", dir, spath) == -1)
348 72342dc9 2020-11-06 op goto childerr;
350 a5d310bc 2020-11-10 op if (asprintf(&requri, "%s%s%s", spath,
351 a5d310bc 2020-11-10 op *relpath == '\0' ? "" : "/",
352 a5d310bc 2020-11-10 op relpath) == -1)
353 a5d310bc 2020-11-10 op goto childerr;
355 a5d310bc 2020-11-10 op argv[0] = argv[1] = ex;
357 60ba426e 2020-11-06 op /* fix the env */
358 9b374f41 2021-01-10 op safe_setenv("GATEWAY_INTERFACE", "CGI/1.1");
359 9b374f41 2021-01-10 op safe_setenv("SERVER_SOFTWARE", "gmid");
360 9b374f41 2021-01-10 op safe_setenv("SERVER_PORT", portno);
361 a5d310bc 2020-11-10 op /* setenv("SERVER_NAME", "", 1); */
362 9b374f41 2021-01-10 op safe_setenv("SCRIPT_NAME", spath);
363 9b374f41 2021-01-10 op safe_setenv("SCRIPT_EXECUTABLE", ex);
364 9b374f41 2021-01-10 op safe_setenv("REQUEST_URI", requri);
365 9b374f41 2021-01-10 op safe_setenv("REQUEST_RELATIVE", relpath);
366 9b374f41 2021-01-10 op safe_setenv("QUERY_STRING", query);
367 9b374f41 2021-01-10 op safe_setenv("REMOTE_HOST", addr);
368 9b374f41 2021-01-10 op safe_setenv("REMOTE_ADDR", addr);
369 9b374f41 2021-01-10 op safe_setenv("DOCUMENT_ROOT", dir);
371 677afbd3 2020-12-02 op if (tls_peer_cert_provided(c->ctx)) {
372 9b374f41 2021-01-10 op safe_setenv("AUTH_TYPE", "Certificate");
373 9b374f41 2021-01-10 op safe_setenv("REMOTE_USER", tls_peer_cert_subject(c->ctx));
374 9b374f41 2021-01-10 op safe_setenv("TLS_CLIENT_ISSUER", tls_peer_cert_issuer(c->ctx));
375 9b374f41 2021-01-10 op safe_setenv("TLS_CLIENT_HASH", tls_peer_cert_hash(c->ctx));
378 a5d310bc 2020-11-10 op execvp(ex, argv);
379 72342dc9 2020-11-06 op goto childerr;
382 72342dc9 2020-11-06 op default: /* parent */
384 72342dc9 2020-11-06 op close(c->fd);
385 72342dc9 2020-11-06 op c->fd = p[0];
386 72342dc9 2020-11-06 op c->child = pid;
387 aff8d190 2020-11-06 op mark_nonblock(c->fd);
388 aff8d190 2020-11-06 op c->state = S_SENDING;
389 72342dc9 2020-11-06 op handle_cgi(fds, c);
394 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
396 72342dc9 2020-11-06 op goodbye(fds, c);
400 72342dc9 2020-11-06 op dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
406 6c6c7a0e 2020-12-28 op cgi_poll_on_child(struct pollfd *fds, struct client *c)
410 aff8d190 2020-11-06 op if (c->waiting_on_child)
412 aff8d190 2020-11-06 op c->waiting_on_child = 1;
414 aff8d190 2020-11-06 op fds->events = POLLIN;
416 aff8d190 2020-11-06 op fd = fds->fd;
417 aff8d190 2020-11-06 op fds->fd = c->fd;
422 6c6c7a0e 2020-12-28 op cgi_poll_on_client(struct pollfd *fds, struct client *c)
426 aff8d190 2020-11-06 op if (!c->waiting_on_child)
428 aff8d190 2020-11-06 op c->waiting_on_child = 0;
430 aff8d190 2020-11-06 op fd = fds->fd;
431 aff8d190 2020-11-06 op fds->fd = c->fd;
436 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
440 aff8d190 2020-11-06 op /* ensure c->fd is the child and fds->fd the client */
441 6c6c7a0e 2020-12-28 op cgi_poll_on_client(fds, c);
444 aff8d190 2020-11-06 op if (c->len == 0) {
445 aff8d190 2020-11-06 op if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
447 aff8d190 2020-11-06 op if (r == -1) {
448 aff8d190 2020-11-06 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
449 6c6c7a0e 2020-12-28 op cgi_poll_on_child(fds, c);
458 aff8d190 2020-11-06 op while (c->len > 0) {
459 aff8d190 2020-11-06 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
463 72342dc9 2020-11-06 op case TLS_WANT_POLLOUT:
464 aff8d190 2020-11-06 op fds->events = POLLOUT;
467 72342dc9 2020-11-06 op case TLS_WANT_POLLIN:
468 aff8d190 2020-11-06 op fds->events = POLLIN;
480 72342dc9 2020-11-06 op goodbye(fds, c);
484 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
486 f28f9311 2020-10-14 op ssize_t ret, len;
488 f28f9311 2020-10-14 op if (c->fd == -1) {
489 75d233f0 2020-11-06 op if (!open_file(path, query, fds, c))
491 f28f9311 2020-10-14 op c->state = S_SENDING;
494 f28f9311 2020-10-14 op len = (c->buf + c->len) - c->i;
496 f28f9311 2020-10-14 op while (len > 0) {
497 f28f9311 2020-10-14 op switch (ret = tls_write(c->ctx, c->i, len)) {
499 d7802bb4 2020-12-02 op LOGE(c, "tls_write: %s", tls_error(c->ctx));
500 f28f9311 2020-10-14 op goodbye(fds, c);
503 f28f9311 2020-10-14 op case TLS_WANT_POLLIN:
504 f28f9311 2020-10-14 op fds->events = POLLIN;
507 f28f9311 2020-10-14 op case TLS_WANT_POLLOUT:
508 f28f9311 2020-10-14 op fds->events = POLLOUT;
518 f28f9311 2020-10-14 op goodbye(fds, c);
522 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
524 3e4749f7 2020-10-02 op char fpath[PATHBUF];
527 3e4749f7 2020-10-02 op bzero(fpath, PATHBUF);
529 9c56b0a7 2020-10-14 op if (path[0] != '.')
530 3e4749f7 2020-10-02 op fpath[0] = '.';
532 3e4749f7 2020-10-02 op /* this cannot fail since sizeof(fpath) > maxlen of path */
533 3e4749f7 2020-10-02 op strlcat(fpath, path, PATHBUF);
534 3e4749f7 2020-10-02 op len = strlen(fpath);
536 3e4749f7 2020-10-02 op /* add a trailing / in case. */
537 3e4749f7 2020-10-02 op if (fpath[len-1] != '/') {
538 3e4749f7 2020-10-02 op fpath[len] = '/';
541 3e4749f7 2020-10-02 op strlcat(fpath, "index.gmi", sizeof(fpath));
543 75d233f0 2020-11-06 op send_file(fpath, NULL, fds, client);
547 592fd624 2020-10-07 op handle(struct pollfd *fds, struct client *client)
549 592fd624 2020-10-07 op char buf[GEMINI_URL_LEN];
550 33d32d1f 2020-12-25 op const char *parse_err;
551 33d32d1f 2020-12-25 op struct uri uri;
553 592fd624 2020-10-07 op switch (client->state) {
555 592fd624 2020-10-07 op bzero(buf, GEMINI_URL_LEN);
556 592fd624 2020-10-07 op switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
558 d7802bb4 2020-12-02 op LOGE(client, "tls_read: %s", tls_error(client->ctx));
559 592fd624 2020-10-07 op goodbye(fds, client);
562 592fd624 2020-10-07 op case TLS_WANT_POLLIN:
563 592fd624 2020-10-07 op fds->events = POLLIN;
566 592fd624 2020-10-07 op case TLS_WANT_POLLOUT:
567 592fd624 2020-10-07 op fds->events = POLLOUT;
571 b3deee7b 2020-12-28 op parse_err = "invalid request";
572 33d32d1f 2020-12-25 op if (!trim_req_uri(buf) || !parse_uri(buf, &uri, &parse_err)) {
573 33d32d1f 2020-12-25 op if (!start_reply(fds, client, BAD_REQUEST, parse_err))
575 592fd624 2020-10-07 op goodbye(fds, client);
579 33d32d1f 2020-12-25 op LOGI(client, "GET %s%s%s",
580 33d32d1f 2020-12-25 op *uri.path ? uri.path : "/",
581 33d32d1f 2020-12-25 op *uri.query ? "?" : "",
582 33d32d1f 2020-12-25 op *uri.query ? uri.query : "");
584 33d32d1f 2020-12-25 op send_file(uri.path, uri.query, fds, client);
587 592fd624 2020-10-07 op case S_INITIALIZING:
588 592fd624 2020-10-07 op if (!start_reply(fds, client, client->code, client->meta))
591 592fd624 2020-10-07 op if (client->code != SUCCESS) {
592 592fd624 2020-10-07 op /* we don't need a body */
593 592fd624 2020-10-07 op goodbye(fds, client);
597 592fd624 2020-10-07 op client->state = S_SENDING;
599 592fd624 2020-10-07 op /* fallthrough */
601 592fd624 2020-10-07 op case S_SENDING:
602 aff8d190 2020-11-06 op if (client->child != -1)
603 aff8d190 2020-11-06 op handle_cgi(fds, client);
605 aff8d190 2020-11-06 op send_file(NULL, NULL, fds, client);
608 592fd624 2020-10-07 op case S_CLOSING:
609 592fd624 2020-10-07 op goodbye(fds, client);
613 592fd624 2020-10-07 op /* unreachable */
619 592fd624 2020-10-07 op mark_nonblock(int fd)
623 592fd624 2020-10-07 op if ((flags = fcntl(fd, F_GETFL)) == -1)
624 80bbcad5 2021-01-10 op fatal("fcntl(F_GETFL): %s", strerror(errno));
625 592fd624 2020-10-07 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
626 80bbcad5 2021-01-10 op fatal("fcntl(F_SETFL): %s", strerror(errno));
630 9468027b 2020-10-15 op make_socket(int port, int family)
633 9468027b 2020-10-15 op struct sockaddr_in addr4;
634 9468027b 2020-10-15 op struct sockaddr_in6 addr6;
635 9468027b 2020-10-15 op struct sockaddr *addr;
636 9468027b 2020-10-15 op socklen_t len;
638 9468027b 2020-10-15 op switch (family) {
639 9468027b 2020-10-15 op case AF_INET:
640 9468027b 2020-10-15 op bzero(&addr4, sizeof(addr4));
641 9468027b 2020-10-15 op addr4.sin_family = family;
642 9468027b 2020-10-15 op addr4.sin_port = htons(port);
643 9468027b 2020-10-15 op addr4.sin_addr.s_addr = INADDR_ANY;
644 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr4;
645 9468027b 2020-10-15 op len = sizeof(addr4);
648 9468027b 2020-10-15 op case AF_INET6:
649 9468027b 2020-10-15 op bzero(&addr6, sizeof(addr6));
650 9468027b 2020-10-15 op addr6.sin6_family = AF_INET6;
651 9468027b 2020-10-15 op addr6.sin6_port = htons(port);
652 9468027b 2020-10-15 op addr6.sin6_addr = in6addr_any;
653 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr6;
654 9468027b 2020-10-15 op len = sizeof(addr6);
658 9468027b 2020-10-15 op /* unreachable */
662 9468027b 2020-10-15 op if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
663 80bbcad5 2021-01-10 op fatal("socket: %s", strerror(errno));
666 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
667 80bbcad5 2021-01-10 op fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
670 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
671 80bbcad5 2021-01-10 op fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
673 592fd624 2020-10-07 op mark_nonblock(sock);
675 9468027b 2020-10-15 op if (bind(sock, addr, len) == -1)
676 80bbcad5 2021-01-10 op fatal("bind: %s", strerror(errno));
678 3e4749f7 2020-10-02 op if (listen(sock, 16) == -1)
679 80bbcad5 2021-01-10 op fatal("listen: %s", strerror(errno));
685 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
688 592fd624 2020-10-07 op struct sockaddr_in addr;
689 3e4749f7 2020-10-02 op socklen_t len;
691 592fd624 2020-10-07 op len = sizeof(addr);
692 592fd624 2020-10-07 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
693 592fd624 2020-10-07 op if (errno == EWOULDBLOCK)
695 80bbcad5 2021-01-10 op fatal("accept: %s", strerror(errno));
698 592fd624 2020-10-07 op mark_nonblock(fd);
700 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
701 592fd624 2020-10-07 op if (fds[i].fd == -1) {
702 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
703 592fd624 2020-10-07 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
704 592fd624 2020-10-07 op break; /* goodbye fd! */
706 592fd624 2020-10-07 op fds[i].fd = fd;
707 592fd624 2020-10-07 op fds[i].events = POLLIN;
709 592fd624 2020-10-07 op clients[i].state = S_OPEN;
710 592fd624 2020-10-07 op clients[i].fd = -1;
711 72342dc9 2020-11-06 op clients[i].child = -1;
712 f28f9311 2020-10-14 op clients[i].buf = MAP_FAILED;
713 2c3a40fa 2020-11-06 op clients[i].af = AF_INET;
714 2c3a40fa 2020-11-06 op clients[i].addr = addr.sin_addr;
716 120381c9 2020-11-06 op connected_clients++;
725 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
729 592fd624 2020-10-07 op c->state = S_CLOSING;
731 592fd624 2020-10-07 op ret = tls_close(c->ctx);
732 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
733 592fd624 2020-10-07 op pfd->events = POLLIN;
736 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
737 592fd624 2020-10-07 op pfd->events = POLLOUT;
741 120381c9 2020-11-06 op connected_clients--;
743 592fd624 2020-10-07 op tls_free(c->ctx);
744 592fd624 2020-10-07 op c->ctx = NULL;
746 f28f9311 2020-10-14 op if (c->buf != MAP_FAILED)
747 f28f9311 2020-10-14 op munmap(c->buf, c->len);
749 592fd624 2020-10-07 op if (c->fd != -1)
750 592fd624 2020-10-07 op close(c->fd);
752 592fd624 2020-10-07 op close(pfd->fd);
753 592fd624 2020-10-07 op pfd->fd = -1;
757 592fd624 2020-10-07 op loop(struct tls *ctx, int sock)
760 592fd624 2020-10-07 op struct client clients[MAX_USERS];
761 592fd624 2020-10-07 op struct pollfd fds[MAX_USERS];
763 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
764 592fd624 2020-10-07 op fds[i].fd = -1;
765 592fd624 2020-10-07 op fds[i].events = POLLIN;
766 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
769 592fd624 2020-10-07 op fds[0].fd = sock;
772 16ace04d 2021-01-08 op if (poll(fds, MAX_USERS, INFTIM) == -1) {
773 120381c9 2020-11-06 op if (errno == EINTR) {
774 d7802bb4 2020-12-02 op warnx("connected clients: %d",
775 d7802bb4 2020-12-02 op connected_clients);
778 80bbcad5 2021-01-10 op fatal("poll: %s", strerror(errno));
781 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; i++) {
782 592fd624 2020-10-07 op if (fds[i].revents == 0)
785 592fd624 2020-10-07 op if (fds[i].revents & (POLLERR|POLLNVAL))
786 80bbcad5 2021-01-10 op fatal("bad fd %d: %s", fds[i].fd,
787 d7802bb4 2020-12-02 op strerror(errno));
789 592fd624 2020-10-07 op if (fds[i].revents & POLLHUP) {
790 aff8d190 2020-11-06 op /* fds[i] may be the fd of the stdin
791 aff8d190 2020-11-06 op * of a cgi script that has exited. */
792 aff8d190 2020-11-06 op if (!clients[i].waiting_on_child) {
793 aff8d190 2020-11-06 op goodbye(&fds[i], &clients[i]);
798 592fd624 2020-10-07 op if (i == 0) { /* new client */
799 592fd624 2020-10-07 op do_accept(sock, ctx, fds, clients);
803 592fd624 2020-10-07 op handle(&fds[i], &clients[i]);
809 231bfcdc 2020-12-21 op absolutify_path(const char *path)
811 231bfcdc 2020-12-21 op char *wd, *r;
813 231bfcdc 2020-12-21 op if (*path == '/')
814 231bfcdc 2020-12-21 op return strdup(path);
816 231bfcdc 2020-12-21 op wd = getwd(NULL);
817 231bfcdc 2020-12-21 op if (asprintf(&r, "%s/%s", wd, path) == -1)
818 231bfcdc 2020-12-21 op err(1, "asprintf");
824 3e4749f7 2020-10-02 op usage(const char *me)
826 3e4749f7 2020-10-02 op fprintf(stderr,
827 72f653b6 2020-11-06 op "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem] "
828 721e2325 2020-11-18 op "[-l logfile] [-p port] [-x cgi-bin]\n",
833 3e4749f7 2020-10-02 op main(int argc, char **argv)
835 72342dc9 2020-11-06 op const char *cert = "cert.pem", *key = "key.pem";
836 3e4749f7 2020-10-02 op struct tls *ctx = NULL;
837 3e4749f7 2020-10-02 op struct tls_config *conf;
838 3e4749f7 2020-10-02 op int sock, ch;
839 120381c9 2020-11-06 op connected_clients = 0;
841 51d876f0 2020-12-21 op if ((dir = absolutify_path("docs")) == NULL)
842 51d876f0 2020-12-21 op err(1, "absolutify_path");
846 d7802bb4 2020-12-02 op foreground = 0;
848 d7802bb4 2020-12-02 op while ((ch = getopt(argc, argv, "c:d:fhk:p:x:")) != -1) {
849 3e4749f7 2020-10-02 op switch (ch) {
851 3e4749f7 2020-10-02 op cert = optarg;
855 231bfcdc 2020-12-21 op free((char*)dir);
856 231bfcdc 2020-12-21 op if ((dir = absolutify_path(optarg)) == NULL)
857 231bfcdc 2020-12-21 op err(1, "absolutify_path");
861 d7802bb4 2020-12-02 op foreground = 1;
865 3e4749f7 2020-10-02 op usage(*argv);
869 3e4749f7 2020-10-02 op key = optarg;
877 721e2325 2020-11-18 op lval = strtol(optarg, &ep, 10);
878 721e2325 2020-11-18 op if (optarg[0] == '\0' || *ep != '\0')
879 721e2325 2020-11-18 op err(1, "not a number: %s", optarg);
880 721e2325 2020-11-18 op if (lval < 0 || lval > UINT16_MAX)
881 721e2325 2020-11-18 op err(1, "port number out of range: %s", optarg);
887 72f653b6 2020-11-06 op cgi = optarg;
891 3e4749f7 2020-10-02 op usage(*argv);
896 4a28dd01 2020-12-28 op signal(SIGPIPE, SIG_IGN);
897 4a28dd01 2020-12-28 op signal(SIGCHLD, SIG_IGN);
899 4a28dd01 2020-12-28 op #ifdef SIGINFO
900 4a28dd01 2020-12-28 op signal(SIGINFO, sig_handler);
902 4a28dd01 2020-12-28 op signal(SIGUSR2, sig_handler);
904 4a28dd01 2020-12-28 op if (!foreground)
905 4a28dd01 2020-12-28 op signal(SIGHUP, SIG_IGN);
907 3e4749f7 2020-10-02 op if ((conf = tls_config_new()) == NULL)
908 3e4749f7 2020-10-02 op err(1, "tls_config_new");
910 677afbd3 2020-12-02 op /* optionally accept client certs, but don't try to verify them */
911 677afbd3 2020-12-02 op tls_config_verify_client_optional(conf);
912 677afbd3 2020-12-02 op tls_config_insecure_noverifycert(conf);
914 0d8ca45a 2020-10-03 op if (tls_config_set_protocols(conf,
915 0d8ca45a 2020-10-03 op TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
916 0d8ca45a 2020-10-03 op err(1, "tls_config_set_protocols");
918 4d4f0e19 2020-10-03 op if (tls_config_set_cert_file(conf, cert) == -1)
919 4d4f0e19 2020-10-03 op err(1, "tls_config_set_cert_file: %s", cert);
921 4d4f0e19 2020-10-03 op if (tls_config_set_key_file(conf, key) == -1)
922 4d4f0e19 2020-10-03 op err(1, "tls_config_set_key_file: %s", key);
924 3e4749f7 2020-10-02 op if ((ctx = tls_server()) == NULL)
925 3e4749f7 2020-10-02 op err(1, "tls_server");
927 3e4749f7 2020-10-02 op if (tls_configure(ctx, conf) == -1)
928 3e4749f7 2020-10-02 op errx(1, "tls_configure: %s", tls_error(ctx));
930 721e2325 2020-11-18 op sock = make_socket(port, AF_INET);
932 3e4749f7 2020-10-02 op if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
933 3e4749f7 2020-10-02 op err(1, "open: %s", dir);
935 d7802bb4 2020-12-02 op if (!foreground && daemon(0, 1) == -1)
938 4c416739 2020-01-01 op if (unveil(dir, "rx") == -1)
939 4c416739 2020-01-01 op err(1, "unveil");
941 4c416739 2020-01-01 op if (pledge("stdio rpath inet proc exec", NULL) == -1)
942 4c416739 2020-01-01 op err(1, "pledge");
944 4c416739 2020-01-01 op /* drop proc and exec if cgi isn't enabled */
945 4c416739 2020-01-01 op if (cgi == NULL && pledge("stdio rpath inet", NULL) == -1)
946 4c416739 2020-01-01 op err(1, "pledge");
948 3e4749f7 2020-10-02 op loop(ctx, sock);
951 3e4749f7 2020-10-02 op tls_free(ctx);
952 3e4749f7 2020-10-02 op tls_config_free(conf);