2 d3a08f4d 2021-01-17 op * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
4 d3a08f4d 2021-01-17 op * Permission to use, copy, modify, and distribute this software for any
5 d3a08f4d 2021-01-17 op * purpose with or without fee is hereby granted, provided that the above
6 d3a08f4d 2021-01-17 op * copyright notice and this permission notice appear in all copies.
8 d3a08f4d 2021-01-17 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 d3a08f4d 2021-01-17 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 d3a08f4d 2021-01-17 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 d3a08f4d 2021-01-17 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 d3a08f4d 2021-01-17 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 d3a08f4d 2021-01-17 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 d3a08f4d 2021-01-17 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 d3a08f4d 2021-01-17 op #include <sys/mman.h>
18 d3a08f4d 2021-01-17 op #include <sys/stat.h>
20 d3a08f4d 2021-01-17 op #include <netdb.h>
22 d3a08f4d 2021-01-17 op #include <assert.h>
23 d3a08f4d 2021-01-17 op #include <errno.h>
24 abc007d2 2021-02-08 op #include <event.h>
25 d3a08f4d 2021-01-17 op #include <fcntl.h>
26 b4d409cf 2021-01-21 op #include <fnmatch.h>
27 2fafa2d2 2021-02-01 op #include <limits.h>
28 d3a08f4d 2021-01-17 op #include <string.h>
30 d3a08f4d 2021-01-17 op #include "gmid.h"
32 abc007d2 2021-02-08 op struct server {
33 abc007d2 2021-02-08 op struct client clients[MAX_USERS];
34 abc007d2 2021-02-08 op struct tls *ctx;
37 abc007d2 2021-02-08 op struct server_events {
38 abc007d2 2021-02-08 op struct event e4;
40 abc007d2 2021-02-08 op struct event e6;
41 abc007d2 2021-02-08 op struct event sighup;
44 d3a08f4d 2021-01-17 op int connected_clients;
46 abc007d2 2021-02-08 op static inline void reschedule_read(int, struct client*, statefn);
47 abc007d2 2021-02-08 op static inline void reschedule_write(int, struct client*, statefn);
49 fe406389 2021-02-02 op static int check_path(struct client*, const char*, int*);
50 abc007d2 2021-02-08 op static void open_file(struct client*);
51 abc007d2 2021-02-08 op static void load_file(struct client*);
52 abc007d2 2021-02-08 op static void check_for_cgi(struct client*);
53 abc007d2 2021-02-08 op static void handle_handshake(int, short, void*);
54 57ec3e77 2021-02-08 op static char *strip_path(char*, int);
55 57ec3e77 2021-02-08 op static void fmt_sbuf(const char*, struct client*, const char*);
56 abc007d2 2021-02-08 op static int apply_block_return(struct client*);
57 02be96c6 2021-02-09 op static int apply_require_ca(struct client*);
58 abc007d2 2021-02-08 op static void handle_open_conn(int, short, void*);
59 abc007d2 2021-02-08 op static void start_reply(struct client*, int, const char*);
60 abc007d2 2021-02-08 op static void handle_start_reply(int, short, void*);
61 abc007d2 2021-02-08 op static void start_cgi(const char*, const char*, struct client*);
62 abc007d2 2021-02-08 op static void send_file(int, short, void*);
63 abc007d2 2021-02-08 op static void open_dir(struct client*);
64 abc007d2 2021-02-08 op static void redirect_canonical_dir(struct client*);
65 abc007d2 2021-02-08 op static void enter_handle_dirlist(int, short, void*);
66 abc007d2 2021-02-08 op static void handle_dirlist(int, short, void*);
67 fe406389 2021-02-02 op static int read_next_dir_entry(struct client*);
68 abc007d2 2021-02-08 op static void send_directory_listing(int, short, void*);
69 abc007d2 2021-02-08 op static void handle_cgi_reply(int, short, void*);
70 abc007d2 2021-02-08 op static void handle_cgi(int, short, void*);
71 abc007d2 2021-02-08 op static void close_conn(int, short, void*);
72 abc007d2 2021-02-08 op static void do_accept(int, short, void*);
73 abc007d2 2021-02-08 op static void handle_sighup(int, short, void*);
75 abc007d2 2021-02-08 op static inline void
76 abc007d2 2021-02-08 op reschedule_read(int fd, struct client *c, statefn fn)
78 abc007d2 2021-02-08 op event_once(fd, EV_READ, fn, c, NULL);
82 abc007d2 2021-02-08 op reschedule_write(int fd, struct client *c, statefn fn)
84 abc007d2 2021-02-08 op event_once(fd, EV_WRITE, fn, c, NULL);
88 c8b74339 2021-01-24 op vhost_lang(struct vhost *v, const char *path)
90 c8b74339 2021-01-24 op struct location *loc;
92 caad0308 2021-01-27 op if (v == NULL || path == NULL)
95 6016a593 2021-01-30 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
96 cd761624 2021-02-06 op if (loc->lang != NULL) {
97 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
98 6016a593 2021-01-30 op return loc->lang;
102 6016a593 2021-01-30 op return v->locations[0].lang;
106 c8b74339 2021-01-24 op vhost_default_mime(struct vhost *v, const char *path)
108 c8b74339 2021-01-24 op struct location *loc;
109 c8b74339 2021-01-24 op const char *default_mime = "application/octet-stream";
111 caad0308 2021-01-27 op if (v == NULL || path == NULL)
112 caad0308 2021-01-27 op return default_mime;
114 6016a593 2021-01-30 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
115 cd761624 2021-02-06 op if (loc->default_mime != NULL) {
116 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
117 6016a593 2021-01-30 op return loc->default_mime;
121 6016a593 2021-01-30 op if (v->locations[0].default_mime != NULL)
122 6016a593 2021-01-30 op return v->locations[0].default_mime;
123 c8b74339 2021-01-24 op return default_mime;
127 c8b74339 2021-01-24 op vhost_index(struct vhost *v, const char *path)
129 c8b74339 2021-01-24 op struct location *loc;
130 c8b74339 2021-01-24 op const char *index = "index.gmi";
132 caad0308 2021-01-27 op if (v == NULL || path == NULL)
133 caad0308 2021-01-27 op return index;
135 6016a593 2021-01-30 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
136 cd761624 2021-02-06 op if (loc->index != NULL) {
137 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
138 6016a593 2021-01-30 op return loc->index;
142 b59f3cdd 2021-01-30 op if (v->locations[0].index != NULL)
143 b59f3cdd 2021-01-30 op return v->locations[0].index;
144 c8b74339 2021-01-24 op return index;
148 252908e6 2021-01-24 op vhost_auto_index(struct vhost *v, const char *path)
150 252908e6 2021-01-24 op struct location *loc;
152 6016a593 2021-01-30 op if (v == NULL || path == NULL)
155 daac4a94 2021-02-06 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
156 cd761624 2021-02-06 op if (loc->auto_index != 0) {
157 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
158 6016a593 2021-01-30 op return loc->auto_index == 1;
162 6016a593 2021-01-30 op return v->locations[0].auto_index == 1;
166 6abda252 2021-02-06 op vhost_block_return(struct vhost *v, const char *path, int *code, const char **fmt)
168 6abda252 2021-02-06 op struct location *loc;
170 6abda252 2021-02-06 op if (v == NULL || path == NULL)
173 6abda252 2021-02-06 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
174 cd761624 2021-02-06 op if (loc->block_code != 0) {
175 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0)) {
176 6abda252 2021-02-06 op *code = loc->block_code;
177 6abda252 2021-02-06 op *fmt = loc->block_fmt;
183 6abda252 2021-02-06 op *code = v->locations[0].block_code;
184 6abda252 2021-02-06 op *fmt = v->locations[0].block_fmt;
185 6abda252 2021-02-06 op return v->locations[0].block_code != 0;
189 6abda252 2021-02-06 op vhost_strip(struct vhost *v, const char *path)
191 6abda252 2021-02-06 op struct location *loc;
193 6abda252 2021-02-06 op if (v == NULL || path == NULL)
196 6abda252 2021-02-06 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
197 cd761624 2021-02-06 op if (loc->strip != 0) {
198 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
199 6abda252 2021-02-06 op return loc->strip;
203 6abda252 2021-02-06 op return v->locations[0].strip;
207 02be96c6 2021-02-09 op vhost_require_ca(struct vhost *v, const char *path)
209 02be96c6 2021-02-09 op struct location *loc;
211 02be96c6 2021-02-09 op if (v == NULL || path == NULL)
214 02be96c6 2021-02-09 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
215 02be96c6 2021-02-09 op if (loc->reqca != NULL) {
216 02be96c6 2021-02-09 op if (!fnmatch(loc->match, path, 0))
217 02be96c6 2021-02-09 op return loc->reqca;
221 02be96c6 2021-02-09 op return v->locations[0].reqca;
225 d3a08f4d 2021-01-17 op check_path(struct client *c, const char *path, int *fd)
227 d3a08f4d 2021-01-17 op struct stat sb;
228 d1ca3911 2021-01-21 op const char *p;
231 d3a08f4d 2021-01-17 op assert(path != NULL);
233 d1ca3911 2021-01-21 op if (*path == '\0')
235 d1ca3911 2021-01-21 op else if (*path == '/')
236 d1ca3911 2021-01-21 op /* in send_dir we add an initial / (to be
237 d1ca3911 2021-01-21 op * redirect-friendly), but here we want to skip it */
242 252908e6 2021-01-24 op flags = O_RDONLY | O_NOFOLLOW;
244 252908e6 2021-01-24 op if (*fd == -1 && (*fd = openat(c->host->dirfd, p, flags)) == -1)
245 d3a08f4d 2021-01-17 op return FILE_MISSING;
247 d3a08f4d 2021-01-17 op if (fstat(*fd, &sb) == -1) {
248 3abf91b0 2021-02-07 op log_notice(c, "failed stat for %s: %s", path, strerror(errno));
249 d3a08f4d 2021-01-17 op return FILE_MISSING;
252 d3a08f4d 2021-01-17 op if (S_ISDIR(sb.st_mode))
253 d3a08f4d 2021-01-17 op return FILE_DIRECTORY;
255 d3a08f4d 2021-01-17 op if (sb.st_mode & S_IXUSR)
256 d3a08f4d 2021-01-17 op return FILE_EXECUTABLE;
258 d3a08f4d 2021-01-17 op return FILE_EXISTS;
262 abc007d2 2021-02-08 op open_file(struct client *c)
264 abc007d2 2021-02-08 op switch (check_path(c, c->iri.path, &c->pfd)) {
265 d3a08f4d 2021-01-17 op case FILE_EXECUTABLE:
266 87f2b68b 2021-02-02 op if (c->host->cgi != NULL && !fnmatch(c->host->cgi, c->iri.path, 0)) {
267 abc007d2 2021-02-08 op start_cgi(c->iri.path, "", c);
271 d3a08f4d 2021-01-17 op /* fallthrough */
273 d3a08f4d 2021-01-17 op case FILE_EXISTS:
274 abc007d2 2021-02-08 op load_file(c);
277 d3a08f4d 2021-01-17 op case FILE_DIRECTORY:
281 d3a08f4d 2021-01-17 op case FILE_MISSING:
282 87f2b68b 2021-02-02 op if (c->host->cgi != NULL && !fnmatch(c->host->cgi, c->iri.path, 0)) {
283 abc007d2 2021-02-08 op check_for_cgi(c);
286 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
290 d3a08f4d 2021-01-17 op /* unreachable */
296 abc007d2 2021-02-08 op load_file(struct client *c)
298 abc007d2 2021-02-08 op if ((c->len = filesize(c->pfd)) == -1) {
299 3abf91b0 2021-02-07 op log_err(c, "failed to get file size for %s: %s",
300 87f2b68b 2021-02-02 op c->iri.path, strerror(errno));
301 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
305 252908e6 2021-01-24 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
306 abc007d2 2021-02-08 op c->pfd, 0)) == MAP_FAILED) {
307 3abf91b0 2021-02-07 op log_err(c, "mmap: %s: %s", c->iri.path, strerror(errno));
308 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
311 252908e6 2021-01-24 op c->i = c->buf;
312 112802ea 2021-02-01 op c->next = send_file;
313 abc007d2 2021-02-08 op start_reply(c, SUCCESS, mime(c->host, c->iri.path));
317 d3a08f4d 2021-01-17 op * the inverse of this algorithm, i.e. starting from the start of the
318 d3a08f4d 2021-01-17 op * path + strlen(cgi), and checking if each component, should be
319 d3a08f4d 2021-01-17 op * faster. But it's tedious to write. This does the opposite: starts
320 d3a08f4d 2021-01-17 op * from the end and strip one component at a time, until either an
321 d3a08f4d 2021-01-17 op * executable is found or we emptied the path.
324 abc007d2 2021-02-08 op check_for_cgi(struct client *c)
326 2fafa2d2 2021-02-01 op char path[PATH_MAX];
329 2fafa2d2 2021-02-01 op strlcpy(path, c->iri.path, sizeof(path));
330 d3a08f4d 2021-01-17 op end = strchr(path, '\0');
332 d3a08f4d 2021-01-17 op while (end > path) {
333 d3a08f4d 2021-01-17 op /* go up one level. UNIX paths are simple and POSIX
334 d3a08f4d 2021-01-17 op * dirname, with its ambiguities on if the given path
335 d3a08f4d 2021-01-17 op * is changed or not, gives me headaches. */
336 d3a08f4d 2021-01-17 op while (*end != '/')
340 abc007d2 2021-02-08 op switch (check_path(c, path, &c->pfd)) {
341 d3a08f4d 2021-01-17 op case FILE_EXECUTABLE:
342 abc007d2 2021-02-08 op start_cgi(path, end+1, c);
344 d3a08f4d 2021-01-17 op case FILE_MISSING:
355 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
360 9b8f5ed2 2021-02-03 op mark_nonblock(int fd)
364 9b8f5ed2 2021-02-03 op if ((flags = fcntl(fd, F_GETFL)) == -1)
365 9b8f5ed2 2021-02-03 op fatal("fcntl(F_GETFL): %s", strerror(errno));
366 9b8f5ed2 2021-02-03 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
367 9b8f5ed2 2021-02-03 op fatal("fcntl(F_SETFL): %s", strerror(errno));
371 abc007d2 2021-02-08 op handle_handshake(int fd, short ev, void *d)
373 abc007d2 2021-02-08 op struct client *c = d;
374 d3a08f4d 2021-01-17 op struct vhost *h;
375 d3a08f4d 2021-01-17 op const char *servname;
376 a8d4a897 2021-01-29 op const char *parse_err = "unknown error";
378 d3a08f4d 2021-01-17 op switch (tls_handshake(c->ctx)) {
379 d3a08f4d 2021-01-17 op case 0: /* success */
380 d3a08f4d 2021-01-17 op case -1: /* already handshaked */
382 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
383 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_handshake);
385 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
386 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_handshake);
389 d3a08f4d 2021-01-17 op /* unreachable */
393 d3a08f4d 2021-01-17 op servname = tls_conn_servername(c->ctx);
394 a8d4a897 2021-01-29 op if (!puny_decode(servname, c->domain, sizeof(c->domain), &parse_err)) {
395 3abf91b0 2021-02-07 op log_info(c, "puny_decode: %s", parse_err);
399 d3a08f4d 2021-01-17 op for (h = hosts; h->domain != NULL; ++h) {
400 3300cbe0 2021-01-27 op if (!fnmatch(h->domain, c->domain, 0))
404 3abf91b0 2021-02-07 op log_debug(c, "handshake: SNI: \"%s\"; decoded: \"%s\"; matched: \"%s\"",
405 3abf91b0 2021-02-07 op servname != NULL ? servname : "(null)",
407 3abf91b0 2021-02-07 op h->domain != NULL ? h->domain : "(null)");
409 d3a08f4d 2021-01-17 op if (h->domain != NULL) {
411 abc007d2 2021-02-08 op handle_open_conn(fd, ev, c);
416 0ab65593 2021-01-21 op if (servname != NULL)
417 0ab65593 2021-01-21 op strncpy(c->req, servname, sizeof(c->req));
419 0ab65593 2021-01-21 op strncpy(c->req, "null", sizeof(c->req));
421 abc007d2 2021-02-08 op start_reply(c, BAD_REQUEST, "Wrong/malformed host or missing SNI");
424 57ec3e77 2021-02-08 op static char *
425 57ec3e77 2021-02-08 op strip_path(char *path, int strip)
429 6abda252 2021-02-06 op while (strip > 0) {
430 6abda252 2021-02-06 op if ((t = strchr(path, '/')) == NULL) {
431 6abda252 2021-02-06 op path = strchr(path, '\0');
442 57ec3e77 2021-02-08 op fmt_sbuf(const char *fmt, struct client *c, const char *path)
445 57ec3e77 2021-02-08 op char buf[32];
447 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
448 6abda252 2021-02-06 op for (i = 0; *fmt; ++fmt) {
449 6abda252 2021-02-06 op if (i == sizeof(buf)-1 || *fmt == '%') {
450 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
451 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
455 6abda252 2021-02-06 op if (*fmt != '%') {
456 6abda252 2021-02-06 op buf[i++] = *fmt;
460 6abda252 2021-02-06 op switch (*++fmt) {
462 6abda252 2021-02-06 op strlcat(c->sbuf, "%", sizeof(c->sbuf));
465 6abda252 2021-02-06 op strlcat(c->sbuf, path, sizeof(c->sbuf));
468 6abda252 2021-02-06 op strlcat(c->sbuf, c->iri.query, sizeof(c->sbuf));
471 6abda252 2021-02-06 op snprintf(buf, sizeof(buf), "%d", conf.port);
472 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
473 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
476 6abda252 2021-02-06 op strlcat(c->sbuf, c->domain, sizeof(c->sbuf));
479 6abda252 2021-02-06 op fatal("%s: unknown fmt specifier %c",
480 6abda252 2021-02-06 op __func__, *fmt);
485 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
488 57ec3e77 2021-02-08 op /* 1 if a matching `block return' (and apply it), 0 otherwise */
490 57ec3e77 2021-02-08 op apply_block_return(struct client *c)
492 57ec3e77 2021-02-08 op const char *fmt, *path;
495 57ec3e77 2021-02-08 op if (!vhost_block_return(c->host, c->iri.path, &code, &fmt))
498 57ec3e77 2021-02-08 op path = strip_path(c->iri.path, vhost_strip(c->host, c->iri.path));
499 57ec3e77 2021-02-08 op fmt_sbuf(fmt, c, path);
501 abc007d2 2021-02-08 op start_reply(c, code, c->sbuf);
505 02be96c6 2021-02-09 op /* 1 if matching `require client ca' fails (and apply it), 0 otherwise */
507 02be96c6 2021-02-09 op apply_require_ca(struct client *c)
509 02be96c6 2021-02-09 op X509_STORE *store;
510 02be96c6 2021-02-09 op const uint8_t *cert;
513 02be96c6 2021-02-09 op if ((store = vhost_require_ca(c->host, c->iri.path)) == NULL)
516 02be96c6 2021-02-09 op if (!tls_peer_cert_provided(c->ctx)) {
517 02be96c6 2021-02-09 op start_reply(c, CLIENT_CERT_REQ, "client certificate required");
521 02be96c6 2021-02-09 op cert = tls_peer_cert_chain_pem(c->ctx, &len);
522 02be96c6 2021-02-09 op if (!validate_against_ca(store, cert, len)) {
523 02be96c6 2021-02-09 op start_reply(c, CERT_NOT_AUTH, "certificate not authorised");
531 abc007d2 2021-02-08 op handle_open_conn(int fd, short ev, void *d)
533 abc007d2 2021-02-08 op struct client *c = d;
534 d3a08f4d 2021-01-17 op const char *parse_err = "invalid request";
535 3300cbe0 2021-01-27 op char decoded[DOMAIN_NAME_LEN];
537 0be51733 2021-01-20 op bzero(c->req, sizeof(c->req));
538 0be51733 2021-01-20 op bzero(&c->iri, sizeof(c->iri));
540 0be51733 2021-01-20 op switch (tls_read(c->ctx, c->req, sizeof(c->req)-1)) {
542 3abf91b0 2021-02-07 op log_err(c, "tls_read: %s", tls_error(c->ctx));
543 abc007d2 2021-02-08 op close_conn(fd, ev, c);
546 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
547 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_open_conn);
550 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
551 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_open_conn);
555 c4f682f8 2021-01-27 op if (!trim_req_iri(c->req, &parse_err)
556 a2fd8013 2021-01-29 op || !parse_iri(c->req, &c->iri, &parse_err)
557 a2fd8013 2021-01-29 op || !puny_decode(c->iri.host, decoded, sizeof(decoded), &parse_err)) {
558 3abf91b0 2021-02-07 op log_info(c, "iri parse error: %s", parse_err);
559 abc007d2 2021-02-08 op start_reply(c, BAD_REQUEST, "invalid request");
563 3300cbe0 2021-01-27 op if (c->iri.port_no != conf.port
564 3300cbe0 2021-01-27 op || strcmp(c->iri.schema, "gemini")
565 3300cbe0 2021-01-27 op || strcmp(decoded, c->domain)) {
566 abc007d2 2021-02-08 op start_reply(c, PROXY_REFUSED, "won't proxy request");
570 02be96c6 2021-02-09 op if (apply_require_ca(c))
573 abc007d2 2021-02-08 op if (apply_block_return(c))
576 e3ddf390 2021-02-06 op if (c->host->entrypoint != NULL) {
577 abc007d2 2021-02-08 op start_cgi(c->host->entrypoint, c->iri.path, c);
581 abc007d2 2021-02-08 op open_file(c);
585 abc007d2 2021-02-08 op start_reply(struct client *c, int code, const char *meta)
587 112802ea 2021-02-01 op c->code = code;
588 112802ea 2021-02-01 op c->meta = meta;
589 abc007d2 2021-02-08 op handle_start_reply(c->fd, 0, c);
593 abc007d2 2021-02-08 op handle_start_reply(int fd, short ev, void *d)
595 abc007d2 2021-02-08 op struct client *c = d;
596 05c23a54 2021-01-19 op char buf[1030]; /* status + ' ' + max reply len + \r\n\0 */
597 c8b74339 2021-01-24 op const char *lang;
600 c8b74339 2021-01-24 op lang = vhost_lang(c->host, c->iri.path);
602 112802ea 2021-02-01 op snprintf(buf, sizeof(buf), "%d ", c->code);
603 112802ea 2021-02-01 op strlcat(buf, c->meta, sizeof(buf));
604 112802ea 2021-02-01 op if (!strcmp(c->meta, "text/gemini") && lang != NULL) {
605 05c23a54 2021-01-19 op strlcat(buf, "; lang=", sizeof(buf));
606 c8b74339 2021-01-24 op strlcat(buf, lang, sizeof(buf));
609 05c23a54 2021-01-19 op len = strlcat(buf, "\r\n", sizeof(buf));
610 0be51733 2021-01-20 op assert(len < sizeof(buf));
612 df79b4c1 2021-01-19 op switch (tls_write(c->ctx, buf, len)) {
614 abc007d2 2021-02-08 op close_conn(fd, ev, c);
616 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
617 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_start_reply);
619 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
620 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_start_reply);
624 a87f6625 2021-01-24 op log_request(c, buf, sizeof(buf));
626 abc007d2 2021-02-08 op if (c->code != SUCCESS)
627 abc007d2 2021-02-08 op close_conn(fd, ev, c);
629 abc007d2 2021-02-08 op c->next(fd, ev, c);
633 abc007d2 2021-02-08 op start_cgi(const char *spath, const char *relpath, struct client *c)
635 d3a08f4d 2021-01-17 op char addr[NI_MAXHOST];
638 d3a08f4d 2021-01-17 op e = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
639 d3a08f4d 2021-01-17 op addr, sizeof(addr),
641 d3a08f4d 2021-01-17 op NI_NUMERICHOST);
645 2fafa2d2 2021-02-01 op if (!send_iri(exfd, &c->iri)
646 2fafa2d2 2021-02-01 op || !send_string(exfd, spath)
647 d3a08f4d 2021-01-17 op || !send_string(exfd, relpath)
648 d3a08f4d 2021-01-17 op || !send_string(exfd, addr)
649 b63e30ff 2021-02-07 op || !send_string(exfd, tls_peer_cert_subject(c->ctx))
650 b63e30ff 2021-02-07 op || !send_string(exfd, tls_peer_cert_issuer(c->ctx))
651 b63e30ff 2021-02-07 op || !send_string(exfd, tls_peer_cert_hash(c->ctx))
652 b63e30ff 2021-02-07 op || !send_time(exfd, tls_peer_cert_notbefore(c->ctx))
653 b63e30ff 2021-02-07 op || !send_time(exfd, tls_peer_cert_notafter(c->ctx))
654 d3a08f4d 2021-01-17 op || !send_vhost(exfd, c->host))
657 abc007d2 2021-02-08 op close(c->pfd);
658 abc007d2 2021-02-08 op if ((c->pfd = recv_fd(exfd)) == -1) {
659 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
663 abc007d2 2021-02-08 op reschedule_read(c->pfd, c, &handle_cgi_reply);
667 d3a08f4d 2021-01-17 op /* fatal("cannot talk to the executor process: %s", strerror(errno)); */
668 132cae8c 2021-01-18 op fatal("cannot talk to the executor process");
672 abc007d2 2021-02-08 op send_file(int fd, short ev, void *d)
674 abc007d2 2021-02-08 op struct client *c = d;
675 d3a08f4d 2021-01-17 op ssize_t ret, len;
677 d3a08f4d 2021-01-17 op len = (c->buf + c->len) - c->i;
679 d3a08f4d 2021-01-17 op while (len > 0) {
680 d3a08f4d 2021-01-17 op switch (ret = tls_write(c->ctx, c->i, len)) {
682 3abf91b0 2021-02-07 op log_err(c, "tls_write: %s", tls_error(c->ctx));
683 abc007d2 2021-02-08 op close_conn(fd, ev, c);
686 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
687 abc007d2 2021-02-08 op reschedule_read(fd, c, &send_file);
690 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
691 abc007d2 2021-02-08 op reschedule_write(fd, c, &send_file);
701 abc007d2 2021-02-08 op close_conn(fd, ev, c);
705 abc007d2 2021-02-08 op open_dir(struct client *c)
709 252908e6 2021-01-24 op char *before_file;
711 0be51733 2021-01-20 op len = strlen(c->iri.path);
712 252908e6 2021-01-24 op if (len > 0 && !ends_with(c->iri.path, "/")) {
713 abc007d2 2021-02-08 op redirect_canonical_dir(c);
717 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
718 d1ca3911 2021-01-21 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
719 d1ca3911 2021-01-21 op if (!ends_with(c->sbuf, "/"))
720 0be51733 2021-01-20 op strlcat(c->sbuf, "/", sizeof(c->sbuf));
721 252908e6 2021-01-24 op before_file = strchr(c->sbuf, '\0');
722 c8b74339 2021-01-24 op len = strlcat(c->sbuf, vhost_index(c->host, c->iri.path),
723 c8b74339 2021-01-24 op sizeof(c->sbuf));
724 252908e6 2021-01-24 op if (len >= sizeof(c->sbuf)) {
725 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
729 252908e6 2021-01-24 op c->iri.path = c->sbuf;
731 252908e6 2021-01-24 op /* close later unless we have to generate the dir listing */
732 abc007d2 2021-02-08 op dirfd = c->pfd;
735 abc007d2 2021-02-08 op switch (check_path(c, c->iri.path, &c->pfd)) {
736 252908e6 2021-01-24 op case FILE_EXECUTABLE:
737 87f2b68b 2021-02-02 op if (c->host->cgi != NULL && !fnmatch(c->host->cgi, c->iri.path, 0)) {
738 abc007d2 2021-02-08 op start_cgi(c->iri.path, "", c);
742 252908e6 2021-01-24 op /* fallthrough */
744 252908e6 2021-01-24 op case FILE_EXISTS:
745 abc007d2 2021-02-08 op load_file(c);
748 252908e6 2021-01-24 op case FILE_DIRECTORY:
749 abc007d2 2021-02-08 op start_reply(c, TEMP_REDIRECT, c->sbuf);
752 252908e6 2021-01-24 op case FILE_MISSING:
753 252908e6 2021-01-24 op *before_file = '\0';
755 252908e6 2021-01-24 op if (!vhost_auto_index(c->host, c->iri.path)) {
756 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
760 abc007d2 2021-02-08 op c->pfd = dirfd;
761 5f715ce4 2021-02-02 op c->next = enter_handle_dirlist;
763 abc007d2 2021-02-08 op if ((c->dir = fdopendir(c->pfd)) == NULL) {
764 3abf91b0 2021-02-07 op log_err(c, "fdopendir(%d) (vhost:%s) %s: %s",
765 abc007d2 2021-02-08 op c->pfd, c->host->domain, c->iri.path, strerror(errno));
766 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
771 abc007d2 2021-02-08 op start_reply(c, SUCCESS, "text/gemini");
775 252908e6 2021-01-24 op /* unreachable */
779 252908e6 2021-01-24 op close(dirfd);
783 abc007d2 2021-02-08 op redirect_canonical_dir(struct client *c)
787 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
788 252908e6 2021-01-24 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
789 252908e6 2021-01-24 op len = strlcat(c->sbuf, "/", sizeof(c->sbuf));
791 0be51733 2021-01-20 op if (len >= sizeof(c->sbuf)) {
792 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
796 abc007d2 2021-02-08 op start_reply(c, TEMP_REDIRECT, c->sbuf);
800 abc007d2 2021-02-08 op enter_handle_dirlist(int fd, short ev, void *d)
802 abc007d2 2021-02-08 op struct client *c = d;
803 5f715ce4 2021-02-02 op char b[PATH_MAX];
806 5f715ce4 2021-02-02 op strlcpy(b, c->iri.path, sizeof(b));
807 5f715ce4 2021-02-02 op l = snprintf(c->sbuf, sizeof(c->sbuf),
808 5f715ce4 2021-02-02 op "# Index of %s\n\n", b);
809 5f715ce4 2021-02-02 op if (l >= sizeof(c->sbuf)) {
810 5f715ce4 2021-02-02 op /* this is impossible, given that we have enough space
811 5f715ce4 2021-02-02 op * in c->sbuf to hold the ancilliary string plus the
812 5f715ce4 2021-02-02 op * full path; but it wouldn't read nice without some
813 5f715ce4 2021-02-02 op * error checking, and I'd like to avoid a strlen. */
814 abc007d2 2021-02-08 op close_conn(fd, ev, c);
819 abc007d2 2021-02-08 op handle_dirlist(fd, ev, c);
823 abc007d2 2021-02-08 op handle_dirlist(int fd, short ev, void *d)
825 abc007d2 2021-02-08 op struct client *c = d;
828 5f715ce4 2021-02-02 op while (c->len > 0) {
829 5f715ce4 2021-02-02 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
831 abc007d2 2021-02-08 op close_conn(fd, ev, c);
833 5f715ce4 2021-02-02 op case TLS_WANT_POLLOUT:
834 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_dirlist);
836 5f715ce4 2021-02-02 op case TLS_WANT_POLLIN:
837 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_dirlist);
845 abc007d2 2021-02-08 op send_directory_listing(fd, ev, c);
849 252908e6 2021-01-24 op read_next_dir_entry(struct client *c)
851 252908e6 2021-01-24 op struct dirent *d;
855 252908e6 2021-01-24 op if ((d = readdir(c->dir)) == NULL) {
856 252908e6 2021-01-24 op if (errno != 0)
857 3abf91b0 2021-02-07 op log_err(c, "readdir: %s", strerror(errno));
860 252908e6 2021-01-24 op } while (!strcmp(d->d_name, "."));
862 252908e6 2021-01-24 op /* XXX: url escape */
863 252908e6 2021-01-24 op snprintf(c->sbuf, sizeof(c->sbuf), "=> %s %s\n",
864 252908e6 2021-01-24 op d->d_name, d->d_name);
865 252908e6 2021-01-24 op c->len = strlen(c->sbuf);
872 abc007d2 2021-02-08 op send_directory_listing(int fd, short ev, void *d)
874 abc007d2 2021-02-08 op struct client *c = d;
878 252908e6 2021-01-24 op if (c->len == 0) {
879 252908e6 2021-01-24 op if (!read_next_dir_entry(c))
883 252908e6 2021-01-24 op while (c->len > 0) {
884 252908e6 2021-01-24 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
888 252908e6 2021-01-24 op case TLS_WANT_POLLOUT:
889 abc007d2 2021-02-08 op reschedule_read(fd, c, &send_directory_listing);
892 252908e6 2021-01-24 op case TLS_WANT_POLLIN:
893 abc007d2 2021-02-08 op reschedule_write(fd, c, &send_directory_listing);
905 abc007d2 2021-02-08 op close_conn(fd, ev, d);
908 35744950 2021-02-01 op /* accumulate the meta line from the cgi script. */
910 abc007d2 2021-02-08 op handle_cgi_reply(int fd, short ev, void *d)
912 abc007d2 2021-02-08 op struct client *c = d;
913 35744950 2021-02-01 op void *buf, *e;
918 35744950 2021-02-01 op buf = c->sbuf + c->len;
919 35744950 2021-02-01 op len = sizeof(c->sbuf) - c->len;
921 abc007d2 2021-02-08 op r = read(c->pfd, buf, len);
922 35744950 2021-02-01 op if (r == 0 || r == -1) {
923 abc007d2 2021-02-08 op start_reply(c, CGI_ERROR, "CGI error");
929 35744950 2021-02-01 op /* TODO: error if the CGI script don't reply correctly */
930 35744950 2021-02-01 op e = strchr(c->sbuf, '\n');
931 35744950 2021-02-01 op if (e != NULL || c->len == sizeof(c->sbuf)) {
932 3309ef97 2021-01-23 op log_request(c, c->sbuf, c->len);
935 abc007d2 2021-02-08 op handle_cgi(fd, ev, c);
939 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_cgi_reply);
943 abc007d2 2021-02-08 op handle_cgi(int fd, short ev, void *d)
945 abc007d2 2021-02-08 op struct client *c = d;
949 35744950 2021-02-01 op if (c->len == 0) {
950 abc007d2 2021-02-08 op switch (r = read(c->pfd, c->sbuf, sizeof(c->sbuf))) {
954 d3a08f4d 2021-01-17 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
955 abc007d2 2021-02-08 op reschedule_read(c->pfd, c, &handle_cgi);
965 d3a08f4d 2021-01-17 op while (c->len > 0) {
966 d3a08f4d 2021-01-17 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
970 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
971 abc007d2 2021-02-08 op reschedule_read(c->fd, c, &handle_cgi);
974 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
975 abc007d2 2021-02-08 op reschedule_write(c->fd, c, &handle_cgi);
987 abc007d2 2021-02-08 op close_conn(c->fd, ev, d);
991 abc007d2 2021-02-08 op close_conn(int fd, short ev, void *d)
993 abc007d2 2021-02-08 op struct client *c = d;
995 d3a08f4d 2021-01-17 op switch (tls_close(c->ctx)) {
996 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
997 abc007d2 2021-02-08 op reschedule_read(fd, c, &close_conn);
999 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
1000 abc007d2 2021-02-08 op reschedule_read(fd, c, &close_conn);
1004 d3a08f4d 2021-01-17 op connected_clients--;
1006 d3a08f4d 2021-01-17 op tls_free(c->ctx);
1007 d3a08f4d 2021-01-17 op c->ctx = NULL;
1009 d3a08f4d 2021-01-17 op if (c->buf != MAP_FAILED)
1010 d3a08f4d 2021-01-17 op munmap(c->buf, c->len);
1012 abc007d2 2021-02-08 op if (c->pfd != -1)
1013 abc007d2 2021-02-08 op close(c->pfd);
1015 252908e6 2021-01-24 op if (c->dir != NULL)
1016 252908e6 2021-01-24 op closedir(c->dir);
1018 abc007d2 2021-02-08 op close(c->fd);
1023 abc007d2 2021-02-08 op do_accept(int sock, short et, void *d)
1025 abc007d2 2021-02-08 op struct client *c;
1026 abc007d2 2021-02-08 op struct server *s = d;
1027 d3a08f4d 2021-01-17 op struct sockaddr_storage addr;
1028 abc007d2 2021-02-08 op struct sockaddr *saddr;
1029 d3a08f4d 2021-01-17 op socklen_t len;
1035 abc007d2 2021-02-08 op saddr = (struct sockaddr*)&addr;
1036 d3a08f4d 2021-01-17 op len = sizeof(addr);
1037 abc007d2 2021-02-08 op if ((fd = accept4(sock, saddr, &len, SOCK_NONBLOCK)) == -1) {
1038 cfb8a77f 2021-02-07 op if (errno == EWOULDBLOCK || errno == EAGAIN)
1040 d3a08f4d 2021-01-17 op fatal("accept: %s", strerror(errno));
1043 d3a08f4d 2021-01-17 op for (i = 0; i < MAX_USERS; ++i) {
1044 abc007d2 2021-02-08 op c = &s->clients[i];
1045 abc007d2 2021-02-08 op if (c->fd == -1) {
1046 abc007d2 2021-02-08 op memset(c, 0, sizeof(*c));
1047 abc007d2 2021-02-08 op if (tls_accept_socket(s->ctx, &c->ctx, fd) == -1)
1048 d3a08f4d 2021-01-17 op break; /* goodbye fd! */
1051 abc007d2 2021-02-08 op c->pfd = -1;
1052 abc007d2 2021-02-08 op c->buf = MAP_FAILED;
1053 abc007d2 2021-02-08 op c->dir = NULL;
1054 abc007d2 2021-02-08 op c->addr = addr;
1056 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_handshake);
1057 d3a08f4d 2021-01-17 op connected_clients++;
1066 abc007d2 2021-02-08 op handle_sighup(int fd, short ev, void *d)
1068 abc007d2 2021-02-08 op struct server_events *events = d;
1073 abc007d2 2021-02-08 op event_del(&events->e4);
1074 abc007d2 2021-02-08 op if (events->has_ipv6)
1075 abc007d2 2021-02-08 op event_del(&events->e6);
1076 abc007d2 2021-02-08 op signal_del(&events->sighup);
1080 abc007d2 2021-02-08 op handle_siginfo(int fd, short ev, void *d)
1086 abc007d2 2021-02-08 op log_info(NULL, "%d connected clients", connected_clients);
1090 abc007d2 2021-02-08 op loop(struct tls *ctx, int sock4, int sock6)
1092 abc007d2 2021-02-08 op struct server_events events;
1093 abc007d2 2021-02-08 op struct server server;
1094 abc007d2 2021-02-08 op struct event info;
1097 abc007d2 2021-02-08 op event_init();
1099 abc007d2 2021-02-08 op memset(&events, 0, sizeof(events));
1100 abc007d2 2021-02-08 op memset(&server, 0, sizeof(server));
1101 abc007d2 2021-02-08 op for (i = 0; i < MAX_USERS; ++i)
1102 abc007d2 2021-02-08 op server.clients[i].fd = -1;
1104 abc007d2 2021-02-08 op event_set(&events.e4, sock4, EV_READ | EV_PERSIST, &do_accept, &server);
1105 abc007d2 2021-02-08 op event_add(&events.e4, NULL);
1107 abc007d2 2021-02-08 op if (sock6 != -1) {
1108 abc007d2 2021-02-08 op events.has_ipv6 = 1;
1109 abc007d2 2021-02-08 op event_set(&events.e6, sock6, EV_READ | EV_PERSIST, &do_accept, &server);
1110 abc007d2 2021-02-08 op event_add(&events.e6, NULL);
1113 abc007d2 2021-02-08 op signal_set(&events.sighup, SIGHUP, &handle_sighup, &events);
1114 abc007d2 2021-02-08 op signal_add(&events.sighup, NULL);
1116 abc007d2 2021-02-08 op #ifdef SIGINFO
1117 abc007d2 2021-02-08 op signal_set(&info, SIGINFO, &handle_siginfo, NULL);
1118 abc007d2 2021-02-08 op signal_add(&info, NULL);
1120 abc007d2 2021-02-08 op signal_set(&info, SIGUSR2, &handle_siginfo, NULL);
1121 abc007d2 2021-02-08 op signal_add(&info, NULL);
1123 abc007d2 2021-02-08 op server.ctx = ctx;
1126 abc007d2 2021-02-08 op event_dispatch();
