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 abc007d2 2021-02-08 op static void handle_open_conn(int, short, void*);
58 abc007d2 2021-02-08 op static void start_reply(struct client*, int, const char*);
59 abc007d2 2021-02-08 op static void handle_start_reply(int, short, void*);
60 abc007d2 2021-02-08 op static void start_cgi(const char*, const char*, struct client*);
61 abc007d2 2021-02-08 op static void send_file(int, short, void*);
62 abc007d2 2021-02-08 op static void open_dir(struct client*);
63 abc007d2 2021-02-08 op static void redirect_canonical_dir(struct client*);
64 abc007d2 2021-02-08 op static void enter_handle_dirlist(int, short, void*);
65 abc007d2 2021-02-08 op static void handle_dirlist(int, short, void*);
66 fe406389 2021-02-02 op static int read_next_dir_entry(struct client*);
67 abc007d2 2021-02-08 op static void send_directory_listing(int, short, void*);
68 abc007d2 2021-02-08 op static void handle_cgi_reply(int, short, void*);
69 abc007d2 2021-02-08 op static void handle_cgi(int, short, void*);
70 abc007d2 2021-02-08 op static void close_conn(int, short, void*);
71 abc007d2 2021-02-08 op static void do_accept(int, short, void*);
72 abc007d2 2021-02-08 op static void handle_sighup(int, short, void*);
74 abc007d2 2021-02-08 op static inline void
75 abc007d2 2021-02-08 op reschedule_read(int fd, struct client *c, statefn fn)
77 abc007d2 2021-02-08 op event_once(fd, EV_READ, fn, c, NULL);
81 abc007d2 2021-02-08 op reschedule_write(int fd, struct client *c, statefn fn)
83 abc007d2 2021-02-08 op event_once(fd, EV_WRITE, fn, c, NULL);
87 c8b74339 2021-01-24 op vhost_lang(struct vhost *v, const char *path)
89 c8b74339 2021-01-24 op struct location *loc;
91 caad0308 2021-01-27 op if (v == NULL || path == NULL)
94 6016a593 2021-01-30 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
95 cd761624 2021-02-06 op if (loc->lang != NULL) {
96 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
97 6016a593 2021-01-30 op return loc->lang;
101 6016a593 2021-01-30 op return v->locations[0].lang;
105 c8b74339 2021-01-24 op vhost_default_mime(struct vhost *v, const char *path)
107 c8b74339 2021-01-24 op struct location *loc;
108 c8b74339 2021-01-24 op const char *default_mime = "application/octet-stream";
110 caad0308 2021-01-27 op if (v == NULL || path == NULL)
111 caad0308 2021-01-27 op return default_mime;
113 6016a593 2021-01-30 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
114 cd761624 2021-02-06 op if (loc->default_mime != NULL) {
115 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
116 6016a593 2021-01-30 op return loc->default_mime;
120 6016a593 2021-01-30 op if (v->locations[0].default_mime != NULL)
121 6016a593 2021-01-30 op return v->locations[0].default_mime;
122 c8b74339 2021-01-24 op return default_mime;
126 c8b74339 2021-01-24 op vhost_index(struct vhost *v, const char *path)
128 c8b74339 2021-01-24 op struct location *loc;
129 c8b74339 2021-01-24 op const char *index = "index.gmi";
131 caad0308 2021-01-27 op if (v == NULL || path == NULL)
132 caad0308 2021-01-27 op return index;
134 6016a593 2021-01-30 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
135 cd761624 2021-02-06 op if (loc->index != NULL) {
136 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
137 6016a593 2021-01-30 op return loc->index;
141 b59f3cdd 2021-01-30 op if (v->locations[0].index != NULL)
142 b59f3cdd 2021-01-30 op return v->locations[0].index;
143 c8b74339 2021-01-24 op return index;
147 252908e6 2021-01-24 op vhost_auto_index(struct vhost *v, const char *path)
149 252908e6 2021-01-24 op struct location *loc;
151 6016a593 2021-01-30 op if (v == NULL || path == NULL)
154 daac4a94 2021-02-06 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
155 cd761624 2021-02-06 op if (loc->auto_index != 0) {
156 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
157 6016a593 2021-01-30 op return loc->auto_index == 1;
161 6016a593 2021-01-30 op return v->locations[0].auto_index == 1;
165 6abda252 2021-02-06 op vhost_block_return(struct vhost *v, const char *path, int *code, const char **fmt)
167 6abda252 2021-02-06 op struct location *loc;
169 6abda252 2021-02-06 op if (v == NULL || path == NULL)
172 6abda252 2021-02-06 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
173 cd761624 2021-02-06 op if (loc->block_code != 0) {
174 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0)) {
175 6abda252 2021-02-06 op *code = loc->block_code;
176 6abda252 2021-02-06 op *fmt = loc->block_fmt;
182 6abda252 2021-02-06 op *code = v->locations[0].block_code;
183 6abda252 2021-02-06 op *fmt = v->locations[0].block_fmt;
184 6abda252 2021-02-06 op return v->locations[0].block_code != 0;
188 6abda252 2021-02-06 op vhost_strip(struct vhost *v, const char *path)
190 6abda252 2021-02-06 op struct location *loc;
192 6abda252 2021-02-06 op if (v == NULL || path == NULL)
195 6abda252 2021-02-06 op for (loc = &v->locations[1]; loc->match != NULL; ++loc) {
196 cd761624 2021-02-06 op if (loc->strip != 0) {
197 cd761624 2021-02-06 op if (!fnmatch(loc->match, path, 0))
198 6abda252 2021-02-06 op return loc->strip;
202 6abda252 2021-02-06 op return v->locations[0].strip;
206 d3a08f4d 2021-01-17 op check_path(struct client *c, const char *path, int *fd)
208 d3a08f4d 2021-01-17 op struct stat sb;
209 d1ca3911 2021-01-21 op const char *p;
212 d3a08f4d 2021-01-17 op assert(path != NULL);
214 d1ca3911 2021-01-21 op if (*path == '\0')
216 d1ca3911 2021-01-21 op else if (*path == '/')
217 d1ca3911 2021-01-21 op /* in send_dir we add an initial / (to be
218 d1ca3911 2021-01-21 op * redirect-friendly), but here we want to skip it */
223 252908e6 2021-01-24 op flags = O_RDONLY | O_NOFOLLOW;
225 252908e6 2021-01-24 op if (*fd == -1 && (*fd = openat(c->host->dirfd, p, flags)) == -1)
226 d3a08f4d 2021-01-17 op return FILE_MISSING;
228 d3a08f4d 2021-01-17 op if (fstat(*fd, &sb) == -1) {
229 3abf91b0 2021-02-07 op log_notice(c, "failed stat for %s: %s", path, strerror(errno));
230 d3a08f4d 2021-01-17 op return FILE_MISSING;
233 d3a08f4d 2021-01-17 op if (S_ISDIR(sb.st_mode))
234 d3a08f4d 2021-01-17 op return FILE_DIRECTORY;
236 d3a08f4d 2021-01-17 op if (sb.st_mode & S_IXUSR)
237 d3a08f4d 2021-01-17 op return FILE_EXECUTABLE;
239 d3a08f4d 2021-01-17 op return FILE_EXISTS;
243 abc007d2 2021-02-08 op open_file(struct client *c)
245 abc007d2 2021-02-08 op switch (check_path(c, c->iri.path, &c->pfd)) {
246 d3a08f4d 2021-01-17 op case FILE_EXECUTABLE:
247 87f2b68b 2021-02-02 op if (c->host->cgi != NULL && !fnmatch(c->host->cgi, c->iri.path, 0)) {
248 abc007d2 2021-02-08 op start_cgi(c->iri.path, "", c);
252 d3a08f4d 2021-01-17 op /* fallthrough */
254 d3a08f4d 2021-01-17 op case FILE_EXISTS:
255 abc007d2 2021-02-08 op load_file(c);
258 d3a08f4d 2021-01-17 op case FILE_DIRECTORY:
262 d3a08f4d 2021-01-17 op case FILE_MISSING:
263 87f2b68b 2021-02-02 op if (c->host->cgi != NULL && !fnmatch(c->host->cgi, c->iri.path, 0)) {
264 abc007d2 2021-02-08 op check_for_cgi(c);
267 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
271 d3a08f4d 2021-01-17 op /* unreachable */
277 abc007d2 2021-02-08 op load_file(struct client *c)
279 abc007d2 2021-02-08 op if ((c->len = filesize(c->pfd)) == -1) {
280 3abf91b0 2021-02-07 op log_err(c, "failed to get file size for %s: %s",
281 87f2b68b 2021-02-02 op c->iri.path, strerror(errno));
282 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
286 252908e6 2021-01-24 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
287 abc007d2 2021-02-08 op c->pfd, 0)) == MAP_FAILED) {
288 3abf91b0 2021-02-07 op log_err(c, "mmap: %s: %s", c->iri.path, strerror(errno));
289 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
292 252908e6 2021-01-24 op c->i = c->buf;
293 112802ea 2021-02-01 op c->next = send_file;
294 abc007d2 2021-02-08 op start_reply(c, SUCCESS, mime(c->host, c->iri.path));
298 d3a08f4d 2021-01-17 op * the inverse of this algorithm, i.e. starting from the start of the
299 d3a08f4d 2021-01-17 op * path + strlen(cgi), and checking if each component, should be
300 d3a08f4d 2021-01-17 op * faster. But it's tedious to write. This does the opposite: starts
301 d3a08f4d 2021-01-17 op * from the end and strip one component at a time, until either an
302 d3a08f4d 2021-01-17 op * executable is found or we emptied the path.
305 abc007d2 2021-02-08 op check_for_cgi(struct client *c)
307 2fafa2d2 2021-02-01 op char path[PATH_MAX];
310 2fafa2d2 2021-02-01 op strlcpy(path, c->iri.path, sizeof(path));
311 d3a08f4d 2021-01-17 op end = strchr(path, '\0');
313 d3a08f4d 2021-01-17 op while (end > path) {
314 d3a08f4d 2021-01-17 op /* go up one level. UNIX paths are simple and POSIX
315 d3a08f4d 2021-01-17 op * dirname, with its ambiguities on if the given path
316 d3a08f4d 2021-01-17 op * is changed or not, gives me headaches. */
317 d3a08f4d 2021-01-17 op while (*end != '/')
321 abc007d2 2021-02-08 op switch (check_path(c, path, &c->pfd)) {
322 d3a08f4d 2021-01-17 op case FILE_EXECUTABLE:
323 abc007d2 2021-02-08 op start_cgi(path, end+1, c);
325 d3a08f4d 2021-01-17 op case FILE_MISSING:
336 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
341 9b8f5ed2 2021-02-03 op mark_nonblock(int fd)
345 9b8f5ed2 2021-02-03 op if ((flags = fcntl(fd, F_GETFL)) == -1)
346 9b8f5ed2 2021-02-03 op fatal("fcntl(F_GETFL): %s", strerror(errno));
347 9b8f5ed2 2021-02-03 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
348 9b8f5ed2 2021-02-03 op fatal("fcntl(F_SETFL): %s", strerror(errno));
352 abc007d2 2021-02-08 op handle_handshake(int fd, short ev, void *d)
354 abc007d2 2021-02-08 op struct client *c = d;
355 d3a08f4d 2021-01-17 op struct vhost *h;
356 d3a08f4d 2021-01-17 op const char *servname;
357 a8d4a897 2021-01-29 op const char *parse_err = "unknown error";
359 d3a08f4d 2021-01-17 op switch (tls_handshake(c->ctx)) {
360 d3a08f4d 2021-01-17 op case 0: /* success */
361 d3a08f4d 2021-01-17 op case -1: /* already handshaked */
363 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
364 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_handshake);
366 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
367 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_handshake);
370 d3a08f4d 2021-01-17 op /* unreachable */
374 d3a08f4d 2021-01-17 op servname = tls_conn_servername(c->ctx);
375 a8d4a897 2021-01-29 op if (!puny_decode(servname, c->domain, sizeof(c->domain), &parse_err)) {
376 3abf91b0 2021-02-07 op log_info(c, "puny_decode: %s", parse_err);
380 d3a08f4d 2021-01-17 op for (h = hosts; h->domain != NULL; ++h) {
381 3300cbe0 2021-01-27 op if (!fnmatch(h->domain, c->domain, 0))
385 3abf91b0 2021-02-07 op log_debug(c, "handshake: SNI: \"%s\"; decoded: \"%s\"; matched: \"%s\"",
386 3abf91b0 2021-02-07 op servname != NULL ? servname : "(null)",
388 3abf91b0 2021-02-07 op h->domain != NULL ? h->domain : "(null)");
390 d3a08f4d 2021-01-17 op if (h->domain != NULL) {
392 abc007d2 2021-02-08 op handle_open_conn(fd, ev, c);
397 0ab65593 2021-01-21 op if (servname != NULL)
398 0ab65593 2021-01-21 op strncpy(c->req, servname, sizeof(c->req));
400 0ab65593 2021-01-21 op strncpy(c->req, "null", sizeof(c->req));
402 abc007d2 2021-02-08 op start_reply(c, BAD_REQUEST, "Wrong/malformed host or missing SNI");
405 57ec3e77 2021-02-08 op static char *
406 57ec3e77 2021-02-08 op strip_path(char *path, int strip)
410 6abda252 2021-02-06 op while (strip > 0) {
411 6abda252 2021-02-06 op if ((t = strchr(path, '/')) == NULL) {
412 6abda252 2021-02-06 op path = strchr(path, '\0');
423 57ec3e77 2021-02-08 op fmt_sbuf(const char *fmt, struct client *c, const char *path)
426 57ec3e77 2021-02-08 op char buf[32];
428 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
429 6abda252 2021-02-06 op for (i = 0; *fmt; ++fmt) {
430 6abda252 2021-02-06 op if (i == sizeof(buf)-1 || *fmt == '%') {
431 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
432 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
436 6abda252 2021-02-06 op if (*fmt != '%') {
437 6abda252 2021-02-06 op buf[i++] = *fmt;
441 6abda252 2021-02-06 op switch (*++fmt) {
443 6abda252 2021-02-06 op strlcat(c->sbuf, "%", sizeof(c->sbuf));
446 6abda252 2021-02-06 op strlcat(c->sbuf, path, sizeof(c->sbuf));
449 6abda252 2021-02-06 op strlcat(c->sbuf, c->iri.query, sizeof(c->sbuf));
452 6abda252 2021-02-06 op snprintf(buf, sizeof(buf), "%d", conf.port);
453 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
454 6abda252 2021-02-06 op memset(buf, 0, sizeof(buf));
457 6abda252 2021-02-06 op strlcat(c->sbuf, c->domain, sizeof(c->sbuf));
460 6abda252 2021-02-06 op fatal("%s: unknown fmt specifier %c",
461 6abda252 2021-02-06 op __func__, *fmt);
466 6abda252 2021-02-06 op strlcat(c->sbuf, buf, sizeof(c->sbuf));
469 57ec3e77 2021-02-08 op /* 1 if a matching `block return' (and apply it), 0 otherwise */
471 57ec3e77 2021-02-08 op apply_block_return(struct client *c)
473 57ec3e77 2021-02-08 op const char *fmt, *path;
476 57ec3e77 2021-02-08 op if (!vhost_block_return(c->host, c->iri.path, &code, &fmt))
479 57ec3e77 2021-02-08 op path = strip_path(c->iri.path, vhost_strip(c->host, c->iri.path));
480 57ec3e77 2021-02-08 op fmt_sbuf(fmt, c, path);
482 abc007d2 2021-02-08 op start_reply(c, code, c->sbuf);
487 abc007d2 2021-02-08 op handle_open_conn(int fd, short ev, void *d)
489 abc007d2 2021-02-08 op struct client *c = d;
490 d3a08f4d 2021-01-17 op const char *parse_err = "invalid request";
491 3300cbe0 2021-01-27 op char decoded[DOMAIN_NAME_LEN];
493 0be51733 2021-01-20 op bzero(c->req, sizeof(c->req));
494 0be51733 2021-01-20 op bzero(&c->iri, sizeof(c->iri));
496 0be51733 2021-01-20 op switch (tls_read(c->ctx, c->req, sizeof(c->req)-1)) {
498 3abf91b0 2021-02-07 op log_err(c, "tls_read: %s", tls_error(c->ctx));
499 abc007d2 2021-02-08 op close_conn(fd, ev, c);
502 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
503 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_open_conn);
506 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
507 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_open_conn);
511 c4f682f8 2021-01-27 op if (!trim_req_iri(c->req, &parse_err)
512 a2fd8013 2021-01-29 op || !parse_iri(c->req, &c->iri, &parse_err)
513 a2fd8013 2021-01-29 op || !puny_decode(c->iri.host, decoded, sizeof(decoded), &parse_err)) {
514 3abf91b0 2021-02-07 op log_info(c, "iri parse error: %s", parse_err);
515 abc007d2 2021-02-08 op start_reply(c, BAD_REQUEST, "invalid request");
519 3300cbe0 2021-01-27 op if (c->iri.port_no != conf.port
520 3300cbe0 2021-01-27 op || strcmp(c->iri.schema, "gemini")
521 3300cbe0 2021-01-27 op || strcmp(decoded, c->domain)) {
522 abc007d2 2021-02-08 op start_reply(c, PROXY_REFUSED, "won't proxy request");
526 abc007d2 2021-02-08 op if (apply_block_return(c))
529 e3ddf390 2021-02-06 op if (c->host->entrypoint != NULL) {
530 abc007d2 2021-02-08 op start_cgi(c->host->entrypoint, c->iri.path, c);
534 abc007d2 2021-02-08 op open_file(c);
538 abc007d2 2021-02-08 op start_reply(struct client *c, int code, const char *meta)
540 112802ea 2021-02-01 op c->code = code;
541 112802ea 2021-02-01 op c->meta = meta;
542 abc007d2 2021-02-08 op handle_start_reply(c->fd, 0, c);
546 abc007d2 2021-02-08 op handle_start_reply(int fd, short ev, void *d)
548 abc007d2 2021-02-08 op struct client *c = d;
549 05c23a54 2021-01-19 op char buf[1030]; /* status + ' ' + max reply len + \r\n\0 */
550 c8b74339 2021-01-24 op const char *lang;
553 c8b74339 2021-01-24 op lang = vhost_lang(c->host, c->iri.path);
555 112802ea 2021-02-01 op snprintf(buf, sizeof(buf), "%d ", c->code);
556 112802ea 2021-02-01 op strlcat(buf, c->meta, sizeof(buf));
557 112802ea 2021-02-01 op if (!strcmp(c->meta, "text/gemini") && lang != NULL) {
558 05c23a54 2021-01-19 op strlcat(buf, "; lang=", sizeof(buf));
559 c8b74339 2021-01-24 op strlcat(buf, lang, sizeof(buf));
562 05c23a54 2021-01-19 op len = strlcat(buf, "\r\n", sizeof(buf));
563 0be51733 2021-01-20 op assert(len < sizeof(buf));
565 df79b4c1 2021-01-19 op switch (tls_write(c->ctx, buf, len)) {
567 abc007d2 2021-02-08 op close_conn(fd, ev, c);
569 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
570 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_start_reply);
572 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
573 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_start_reply);
577 a87f6625 2021-01-24 op log_request(c, buf, sizeof(buf));
579 abc007d2 2021-02-08 op if (c->code != SUCCESS)
580 abc007d2 2021-02-08 op close_conn(fd, ev, c);
582 abc007d2 2021-02-08 op c->next(fd, ev, c);
586 abc007d2 2021-02-08 op start_cgi(const char *spath, const char *relpath, struct client *c)
588 d3a08f4d 2021-01-17 op char addr[NI_MAXHOST];
591 d3a08f4d 2021-01-17 op e = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
592 d3a08f4d 2021-01-17 op addr, sizeof(addr),
594 d3a08f4d 2021-01-17 op NI_NUMERICHOST);
598 2fafa2d2 2021-02-01 op if (!send_iri(exfd, &c->iri)
599 2fafa2d2 2021-02-01 op || !send_string(exfd, spath)
600 d3a08f4d 2021-01-17 op || !send_string(exfd, relpath)
601 d3a08f4d 2021-01-17 op || !send_string(exfd, addr)
602 b63e30ff 2021-02-07 op || !send_string(exfd, tls_peer_cert_subject(c->ctx))
603 b63e30ff 2021-02-07 op || !send_string(exfd, tls_peer_cert_issuer(c->ctx))
604 b63e30ff 2021-02-07 op || !send_string(exfd, tls_peer_cert_hash(c->ctx))
605 b63e30ff 2021-02-07 op || !send_time(exfd, tls_peer_cert_notbefore(c->ctx))
606 b63e30ff 2021-02-07 op || !send_time(exfd, tls_peer_cert_notafter(c->ctx))
607 d3a08f4d 2021-01-17 op || !send_vhost(exfd, c->host))
610 abc007d2 2021-02-08 op close(c->pfd);
611 abc007d2 2021-02-08 op if ((c->pfd = recv_fd(exfd)) == -1) {
612 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
616 abc007d2 2021-02-08 op reschedule_read(c->pfd, c, &handle_cgi_reply);
620 d3a08f4d 2021-01-17 op /* fatal("cannot talk to the executor process: %s", strerror(errno)); */
621 132cae8c 2021-01-18 op fatal("cannot talk to the executor process");
625 abc007d2 2021-02-08 op send_file(int fd, short ev, void *d)
627 abc007d2 2021-02-08 op struct client *c = d;
628 d3a08f4d 2021-01-17 op ssize_t ret, len;
630 d3a08f4d 2021-01-17 op len = (c->buf + c->len) - c->i;
632 d3a08f4d 2021-01-17 op while (len > 0) {
633 d3a08f4d 2021-01-17 op switch (ret = tls_write(c->ctx, c->i, len)) {
635 3abf91b0 2021-02-07 op log_err(c, "tls_write: %s", tls_error(c->ctx));
636 abc007d2 2021-02-08 op close_conn(fd, ev, c);
639 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
640 abc007d2 2021-02-08 op reschedule_read(fd, c, &send_file);
643 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
644 abc007d2 2021-02-08 op reschedule_write(fd, c, &send_file);
654 abc007d2 2021-02-08 op close_conn(fd, ev, c);
658 abc007d2 2021-02-08 op open_dir(struct client *c)
662 252908e6 2021-01-24 op char *before_file;
664 0be51733 2021-01-20 op len = strlen(c->iri.path);
665 252908e6 2021-01-24 op if (len > 0 && !ends_with(c->iri.path, "/")) {
666 abc007d2 2021-02-08 op redirect_canonical_dir(c);
670 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
671 d1ca3911 2021-01-21 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
672 d1ca3911 2021-01-21 op if (!ends_with(c->sbuf, "/"))
673 0be51733 2021-01-20 op strlcat(c->sbuf, "/", sizeof(c->sbuf));
674 252908e6 2021-01-24 op before_file = strchr(c->sbuf, '\0');
675 c8b74339 2021-01-24 op len = strlcat(c->sbuf, vhost_index(c->host, c->iri.path),
676 c8b74339 2021-01-24 op sizeof(c->sbuf));
677 252908e6 2021-01-24 op if (len >= sizeof(c->sbuf)) {
678 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
682 252908e6 2021-01-24 op c->iri.path = c->sbuf;
684 252908e6 2021-01-24 op /* close later unless we have to generate the dir listing */
685 abc007d2 2021-02-08 op dirfd = c->pfd;
688 abc007d2 2021-02-08 op switch (check_path(c, c->iri.path, &c->pfd)) {
689 252908e6 2021-01-24 op case FILE_EXECUTABLE:
690 87f2b68b 2021-02-02 op if (c->host->cgi != NULL && !fnmatch(c->host->cgi, c->iri.path, 0)) {
691 abc007d2 2021-02-08 op start_cgi(c->iri.path, "", c);
695 252908e6 2021-01-24 op /* fallthrough */
697 252908e6 2021-01-24 op case FILE_EXISTS:
698 abc007d2 2021-02-08 op load_file(c);
701 252908e6 2021-01-24 op case FILE_DIRECTORY:
702 abc007d2 2021-02-08 op start_reply(c, TEMP_REDIRECT, c->sbuf);
705 252908e6 2021-01-24 op case FILE_MISSING:
706 252908e6 2021-01-24 op *before_file = '\0';
708 252908e6 2021-01-24 op if (!vhost_auto_index(c->host, c->iri.path)) {
709 abc007d2 2021-02-08 op start_reply(c, NOT_FOUND, "not found");
713 abc007d2 2021-02-08 op c->pfd = dirfd;
714 5f715ce4 2021-02-02 op c->next = enter_handle_dirlist;
716 abc007d2 2021-02-08 op if ((c->dir = fdopendir(c->pfd)) == NULL) {
717 3abf91b0 2021-02-07 op log_err(c, "fdopendir(%d) (vhost:%s) %s: %s",
718 abc007d2 2021-02-08 op c->pfd, c->host->domain, c->iri.path, strerror(errno));
719 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
724 abc007d2 2021-02-08 op start_reply(c, SUCCESS, "text/gemini");
728 252908e6 2021-01-24 op /* unreachable */
732 252908e6 2021-01-24 op close(dirfd);
736 abc007d2 2021-02-08 op redirect_canonical_dir(struct client *c)
740 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
741 252908e6 2021-01-24 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
742 252908e6 2021-01-24 op len = strlcat(c->sbuf, "/", sizeof(c->sbuf));
744 0be51733 2021-01-20 op if (len >= sizeof(c->sbuf)) {
745 abc007d2 2021-02-08 op start_reply(c, TEMP_FAILURE, "internal server error");
749 abc007d2 2021-02-08 op start_reply(c, TEMP_REDIRECT, c->sbuf);
753 abc007d2 2021-02-08 op enter_handle_dirlist(int fd, short ev, void *d)
755 abc007d2 2021-02-08 op struct client *c = d;
756 5f715ce4 2021-02-02 op char b[PATH_MAX];
759 5f715ce4 2021-02-02 op strlcpy(b, c->iri.path, sizeof(b));
760 5f715ce4 2021-02-02 op l = snprintf(c->sbuf, sizeof(c->sbuf),
761 5f715ce4 2021-02-02 op "# Index of %s\n\n", b);
762 5f715ce4 2021-02-02 op if (l >= sizeof(c->sbuf)) {
763 5f715ce4 2021-02-02 op /* this is impossible, given that we have enough space
764 5f715ce4 2021-02-02 op * in c->sbuf to hold the ancilliary string plus the
765 5f715ce4 2021-02-02 op * full path; but it wouldn't read nice without some
766 5f715ce4 2021-02-02 op * error checking, and I'd like to avoid a strlen. */
767 abc007d2 2021-02-08 op close_conn(fd, ev, c);
772 abc007d2 2021-02-08 op handle_dirlist(fd, ev, c);
776 abc007d2 2021-02-08 op handle_dirlist(int fd, short ev, void *d)
778 abc007d2 2021-02-08 op struct client *c = d;
781 5f715ce4 2021-02-02 op while (c->len > 0) {
782 5f715ce4 2021-02-02 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
784 abc007d2 2021-02-08 op close_conn(fd, ev, c);
786 5f715ce4 2021-02-02 op case TLS_WANT_POLLOUT:
787 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_dirlist);
789 5f715ce4 2021-02-02 op case TLS_WANT_POLLIN:
790 abc007d2 2021-02-08 op reschedule_write(fd, c, &handle_dirlist);
798 abc007d2 2021-02-08 op send_directory_listing(fd, ev, c);
802 252908e6 2021-01-24 op read_next_dir_entry(struct client *c)
804 252908e6 2021-01-24 op struct dirent *d;
808 252908e6 2021-01-24 op if ((d = readdir(c->dir)) == NULL) {
809 252908e6 2021-01-24 op if (errno != 0)
810 3abf91b0 2021-02-07 op log_err(c, "readdir: %s", strerror(errno));
813 252908e6 2021-01-24 op } while (!strcmp(d->d_name, "."));
815 252908e6 2021-01-24 op /* XXX: url escape */
816 252908e6 2021-01-24 op snprintf(c->sbuf, sizeof(c->sbuf), "=> %s %s\n",
817 252908e6 2021-01-24 op d->d_name, d->d_name);
818 252908e6 2021-01-24 op c->len = strlen(c->sbuf);
825 abc007d2 2021-02-08 op send_directory_listing(int fd, short ev, void *d)
827 abc007d2 2021-02-08 op struct client *c = d;
831 252908e6 2021-01-24 op if (c->len == 0) {
832 252908e6 2021-01-24 op if (!read_next_dir_entry(c))
836 252908e6 2021-01-24 op while (c->len > 0) {
837 252908e6 2021-01-24 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
841 252908e6 2021-01-24 op case TLS_WANT_POLLOUT:
842 abc007d2 2021-02-08 op reschedule_read(fd, c, &send_directory_listing);
845 252908e6 2021-01-24 op case TLS_WANT_POLLIN:
846 abc007d2 2021-02-08 op reschedule_write(fd, c, &send_directory_listing);
858 abc007d2 2021-02-08 op close_conn(fd, ev, d);
861 35744950 2021-02-01 op /* accumulate the meta line from the cgi script. */
863 abc007d2 2021-02-08 op handle_cgi_reply(int fd, short ev, void *d)
865 abc007d2 2021-02-08 op struct client *c = d;
866 35744950 2021-02-01 op void *buf, *e;
871 35744950 2021-02-01 op buf = c->sbuf + c->len;
872 35744950 2021-02-01 op len = sizeof(c->sbuf) - c->len;
874 abc007d2 2021-02-08 op r = read(c->pfd, buf, len);
875 35744950 2021-02-01 op if (r == 0 || r == -1) {
876 abc007d2 2021-02-08 op start_reply(c, CGI_ERROR, "CGI error");
882 35744950 2021-02-01 op /* TODO: error if the CGI script don't reply correctly */
883 35744950 2021-02-01 op e = strchr(c->sbuf, '\n');
884 35744950 2021-02-01 op if (e != NULL || c->len == sizeof(c->sbuf)) {
885 3309ef97 2021-01-23 op log_request(c, c->sbuf, c->len);
888 abc007d2 2021-02-08 op handle_cgi(fd, ev, c);
892 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_cgi_reply);
896 abc007d2 2021-02-08 op handle_cgi(int fd, short ev, void *d)
898 abc007d2 2021-02-08 op struct client *c = d;
902 35744950 2021-02-01 op if (c->len == 0) {
903 abc007d2 2021-02-08 op switch (r = read(c->pfd, c->sbuf, sizeof(c->sbuf))) {
907 d3a08f4d 2021-01-17 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
908 abc007d2 2021-02-08 op reschedule_read(c->pfd, c, &handle_cgi);
918 d3a08f4d 2021-01-17 op while (c->len > 0) {
919 d3a08f4d 2021-01-17 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
923 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
924 abc007d2 2021-02-08 op reschedule_read(c->fd, c, &handle_cgi);
927 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
928 abc007d2 2021-02-08 op reschedule_write(c->fd, c, &handle_cgi);
940 abc007d2 2021-02-08 op close_conn(c->fd, ev, d);
944 abc007d2 2021-02-08 op close_conn(int fd, short ev, void *d)
946 abc007d2 2021-02-08 op struct client *c = d;
948 d3a08f4d 2021-01-17 op switch (tls_close(c->ctx)) {
949 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
950 abc007d2 2021-02-08 op reschedule_read(fd, c, &close_conn);
952 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
953 abc007d2 2021-02-08 op reschedule_read(fd, c, &close_conn);
957 d3a08f4d 2021-01-17 op connected_clients--;
959 d3a08f4d 2021-01-17 op tls_free(c->ctx);
960 d3a08f4d 2021-01-17 op c->ctx = NULL;
962 d3a08f4d 2021-01-17 op if (c->buf != MAP_FAILED)
963 d3a08f4d 2021-01-17 op munmap(c->buf, c->len);
965 abc007d2 2021-02-08 op if (c->pfd != -1)
966 abc007d2 2021-02-08 op close(c->pfd);
968 252908e6 2021-01-24 op if (c->dir != NULL)
969 252908e6 2021-01-24 op closedir(c->dir);
971 abc007d2 2021-02-08 op close(c->fd);
976 abc007d2 2021-02-08 op do_accept(int sock, short et, void *d)
978 abc007d2 2021-02-08 op struct client *c;
979 abc007d2 2021-02-08 op struct server *s = d;
980 d3a08f4d 2021-01-17 op struct sockaddr_storage addr;
981 abc007d2 2021-02-08 op struct sockaddr *saddr;
982 d3a08f4d 2021-01-17 op socklen_t len;
988 abc007d2 2021-02-08 op saddr = (struct sockaddr*)&addr;
989 d3a08f4d 2021-01-17 op len = sizeof(addr);
990 abc007d2 2021-02-08 op if ((fd = accept4(sock, saddr, &len, SOCK_NONBLOCK)) == -1) {
991 cfb8a77f 2021-02-07 op if (errno == EWOULDBLOCK || errno == EAGAIN)
993 d3a08f4d 2021-01-17 op fatal("accept: %s", strerror(errno));
996 d3a08f4d 2021-01-17 op for (i = 0; i < MAX_USERS; ++i) {
997 abc007d2 2021-02-08 op c = &s->clients[i];
998 abc007d2 2021-02-08 op if (c->fd == -1) {
999 abc007d2 2021-02-08 op memset(c, 0, sizeof(*c));
1000 abc007d2 2021-02-08 op if (tls_accept_socket(s->ctx, &c->ctx, fd) == -1)
1001 d3a08f4d 2021-01-17 op break; /* goodbye fd! */
1004 abc007d2 2021-02-08 op c->pfd = -1;
1005 abc007d2 2021-02-08 op c->buf = MAP_FAILED;
1006 abc007d2 2021-02-08 op c->dir = NULL;
1007 abc007d2 2021-02-08 op c->addr = addr;
1009 abc007d2 2021-02-08 op reschedule_read(fd, c, &handle_handshake);
1010 d3a08f4d 2021-01-17 op connected_clients++;
1019 abc007d2 2021-02-08 op handle_sighup(int fd, short ev, void *d)
1021 abc007d2 2021-02-08 op struct server_events *events = d;
1026 abc007d2 2021-02-08 op event_del(&events->e4);
1027 abc007d2 2021-02-08 op if (events->has_ipv6)
1028 abc007d2 2021-02-08 op event_del(&events->e6);
1029 abc007d2 2021-02-08 op signal_del(&events->sighup);
1033 abc007d2 2021-02-08 op handle_siginfo(int fd, short ev, void *d)
1039 abc007d2 2021-02-08 op log_info(NULL, "%d connected clients", connected_clients);
1043 abc007d2 2021-02-08 op loop(struct tls *ctx, int sock4, int sock6)
1045 abc007d2 2021-02-08 op struct server_events events;
1046 abc007d2 2021-02-08 op struct server server;
1047 abc007d2 2021-02-08 op struct event info;
1050 abc007d2 2021-02-08 op event_init();
1052 abc007d2 2021-02-08 op memset(&events, 0, sizeof(events));
1053 abc007d2 2021-02-08 op memset(&server, 0, sizeof(server));
1054 abc007d2 2021-02-08 op for (i = 0; i < MAX_USERS; ++i)
1055 abc007d2 2021-02-08 op server.clients[i].fd = -1;
1057 abc007d2 2021-02-08 op event_set(&events.e4, sock4, EV_READ | EV_PERSIST, &do_accept, &server);
1058 abc007d2 2021-02-08 op event_add(&events.e4, NULL);
1060 abc007d2 2021-02-08 op if (sock6 != -1) {
1061 abc007d2 2021-02-08 op events.has_ipv6 = 1;
1062 abc007d2 2021-02-08 op event_set(&events.e6, sock6, EV_READ | EV_PERSIST, &do_accept, &server);
1063 abc007d2 2021-02-08 op event_add(&events.e6, NULL);
1066 abc007d2 2021-02-08 op signal_set(&events.sighup, SIGHUP, &handle_sighup, &events);
1067 abc007d2 2021-02-08 op signal_add(&events.sighup, NULL);
1069 abc007d2 2021-02-08 op #ifdef SIGINFO
1070 abc007d2 2021-02-08 op signal_set(&info, SIGINFO, &handle_siginfo, NULL);
1071 abc007d2 2021-02-08 op signal_add(&info, NULL);
1073 abc007d2 2021-02-08 op signal_set(&info, SIGUSR2, &handle_siginfo, NULL);
1074 abc007d2 2021-02-08 op signal_add(&info, NULL);
1076 abc007d2 2021-02-08 op server.ctx = ctx;
1079 abc007d2 2021-02-08 op event_dispatch();
