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 d3a08f4d 2021-01-17 op #include <fcntl.h>
25 b4d409cf 2021-01-21 op #include <fnmatch.h>
26 d3a08f4d 2021-01-17 op #include <string.h>
28 d3a08f4d 2021-01-17 op #include "gmid.h"
30 d3a08f4d 2021-01-17 op int connected_clients;
33 c8b74339 2021-01-24 op vhost_lang(struct vhost *v, const char *path)
35 c8b74339 2021-01-24 op struct location *loc;
36 c8b74339 2021-01-24 op const char *lang = NULL;
38 c8b74339 2021-01-24 op for (loc = v->locations; loc->match != NULL; ++loc) {
39 c8b74339 2021-01-24 op if (!fnmatch(loc->match, path, 0)) {
40 c8b74339 2021-01-24 op if (loc->lang != NULL)
41 c8b74339 2021-01-24 op lang = loc->lang;
49 c8b74339 2021-01-24 op vhost_default_mime(struct vhost *v, const char *path)
51 c8b74339 2021-01-24 op struct location *loc;
52 c8b74339 2021-01-24 op const char *default_mime = "application/octet-stream";
54 c8b74339 2021-01-24 op for (loc = v->locations; loc->match != NULL; ++loc) {
55 c8b74339 2021-01-24 op if (!fnmatch(loc->match, path, 0)) {
56 c8b74339 2021-01-24 op if (loc->default_mime != NULL)
57 c8b74339 2021-01-24 op default_mime = loc->default_mime;
61 c8b74339 2021-01-24 op return default_mime;
65 c8b74339 2021-01-24 op vhost_index(struct vhost *v, const char *path)
67 c8b74339 2021-01-24 op struct location *loc;
68 c8b74339 2021-01-24 op const char *index = "index.gmi";
70 c8b74339 2021-01-24 op for (loc = v->locations; loc->match != NULL; ++loc) {
71 c8b74339 2021-01-24 op if (!fnmatch(loc->match, path, 0)) {
72 c8b74339 2021-01-24 op if (loc->index != NULL)
73 c8b74339 2021-01-24 op index = loc->index;
81 252908e6 2021-01-24 op vhost_auto_index(struct vhost *v, const char *path)
83 252908e6 2021-01-24 op struct location *loc;
84 252908e6 2021-01-24 op int auto_index = 0;
86 252908e6 2021-01-24 op for (loc = v->locations; loc->match != NULL; ++loc) {
87 252908e6 2021-01-24 op if (!fnmatch(loc->match, path, 0)) {
88 252908e6 2021-01-24 op if (loc->auto_index)
89 252908e6 2021-01-24 op auto_index = loc->auto_index;
93 252908e6 2021-01-24 op return auto_index == 1;
97 d3a08f4d 2021-01-17 op check_path(struct client *c, const char *path, int *fd)
99 d3a08f4d 2021-01-17 op struct stat sb;
100 d1ca3911 2021-01-21 op const char *p;
103 d3a08f4d 2021-01-17 op assert(path != NULL);
105 d1ca3911 2021-01-21 op if (*path == '\0')
107 d1ca3911 2021-01-21 op else if (*path == '/')
108 d1ca3911 2021-01-21 op /* in send_dir we add an initial / (to be
109 d1ca3911 2021-01-21 op * redirect-friendly), but here we want to skip it */
114 252908e6 2021-01-24 op flags = O_RDONLY | O_NOFOLLOW;
116 252908e6 2021-01-24 op if (*fd == -1 && (*fd = openat(c->host->dirfd, p, flags)) == -1)
117 d3a08f4d 2021-01-17 op return FILE_MISSING;
119 d3a08f4d 2021-01-17 op if (fstat(*fd, &sb) == -1) {
120 d3a08f4d 2021-01-17 op LOGN(c, "failed stat for %s: %s", path, strerror(errno));
121 d3a08f4d 2021-01-17 op return FILE_MISSING;
124 d3a08f4d 2021-01-17 op if (S_ISDIR(sb.st_mode))
125 d3a08f4d 2021-01-17 op return FILE_DIRECTORY;
127 d3a08f4d 2021-01-17 op if (sb.st_mode & S_IXUSR)
128 d3a08f4d 2021-01-17 op return FILE_EXECUTABLE;
130 d3a08f4d 2021-01-17 op return FILE_EXISTS;
134 0be51733 2021-01-20 op open_file(struct pollfd *fds, struct client *c)
136 0be51733 2021-01-20 op switch (check_path(c, c->iri.path, &c->fd)) {
137 d3a08f4d 2021-01-17 op case FILE_EXECUTABLE:
138 252908e6 2021-01-24 op if (starts_with(c->iri.path, c->host->cgi)) {
139 07b0a142 2021-01-24 op start_cgi(c->iri.path, "", c->iri.query, fds, c);
143 d3a08f4d 2021-01-17 op /* fallthrough */
145 d3a08f4d 2021-01-17 op case FILE_EXISTS:
146 252908e6 2021-01-24 op load_file(fds, c);
149 d3a08f4d 2021-01-17 op case FILE_DIRECTORY:
150 252908e6 2021-01-24 op open_dir(fds, c);
153 d3a08f4d 2021-01-17 op case FILE_MISSING:
154 07b0a142 2021-01-24 op if (c->host->cgi != NULL && starts_with(c->iri.path, c->host->cgi)) {
155 07b0a142 2021-01-24 op check_for_cgi(c->iri.path, c->iri.query, fds, c);
158 a87f6625 2021-01-24 op start_reply(fds, c, NOT_FOUND, "not found");
162 d3a08f4d 2021-01-17 op /* unreachable */
168 252908e6 2021-01-24 op load_file(struct pollfd *fds, struct client *c)
170 252908e6 2021-01-24 op if ((c->len = filesize(c->fd)) == -1) {
171 252908e6 2021-01-24 op LOGE(c, "failed to get file size for %s", c->iri.path);
172 252908e6 2021-01-24 op start_reply(fds, c, TEMP_FAILURE, "internal server error");
176 252908e6 2021-01-24 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
177 252908e6 2021-01-24 op c->fd, 0)) == MAP_FAILED) {
178 252908e6 2021-01-24 op LOGW(c, "mmap: %s: %s", c->iri.path, strerror(errno));
179 252908e6 2021-01-24 op start_reply(fds, c, TEMP_FAILURE, "internal server error");
182 252908e6 2021-01-24 op c->i = c->buf;
183 252908e6 2021-01-24 op c->next = S_SENDING_FILE;
184 252908e6 2021-01-24 op start_reply(fds, c, SUCCESS, mime(c->host, c->iri.path));
188 d3a08f4d 2021-01-17 op * the inverse of this algorithm, i.e. starting from the start of the
189 d3a08f4d 2021-01-17 op * path + strlen(cgi), and checking if each component, should be
190 d3a08f4d 2021-01-17 op * faster. But it's tedious to write. This does the opposite: starts
191 d3a08f4d 2021-01-17 op * from the end and strip one component at a time, until either an
192 d3a08f4d 2021-01-17 op * executable is found or we emptied the path.
195 d3a08f4d 2021-01-17 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
198 d3a08f4d 2021-01-17 op end = strchr(path, '\0');
200 d3a08f4d 2021-01-17 op /* NB: assume CGI is enabled and path matches cgi */
202 d3a08f4d 2021-01-17 op while (end > path) {
203 d3a08f4d 2021-01-17 op /* go up one level. UNIX paths are simple and POSIX
204 d3a08f4d 2021-01-17 op * dirname, with its ambiguities on if the given path
205 d3a08f4d 2021-01-17 op * is changed or not, gives me headaches. */
206 d3a08f4d 2021-01-17 op while (*end != '/')
210 d3a08f4d 2021-01-17 op switch (check_path(c, path, &c->fd)) {
211 d3a08f4d 2021-01-17 op case FILE_EXECUTABLE:
212 07b0a142 2021-01-24 op start_cgi(path, end+1, query, fds,c);
214 d3a08f4d 2021-01-17 op case FILE_MISSING:
225 a87f6625 2021-01-24 op start_reply(fds, c, NOT_FOUND, "not found");
230 d3a08f4d 2021-01-17 op mark_nonblock(int fd)
234 d3a08f4d 2021-01-17 op if ((flags = fcntl(fd, F_GETFL)) == -1)
235 d3a08f4d 2021-01-17 op fatal("fcntl(F_GETFL): %s", strerror(errno));
236 d3a08f4d 2021-01-17 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
237 d3a08f4d 2021-01-17 op fatal("fcntl(F_SETFL): %s", strerror(errno));
241 d3a08f4d 2021-01-17 op handle_handshake(struct pollfd *fds, struct client *c)
243 d3a08f4d 2021-01-17 op struct vhost *h;
244 d3a08f4d 2021-01-17 op const char *servname;
246 d3a08f4d 2021-01-17 op switch (tls_handshake(c->ctx)) {
247 d3a08f4d 2021-01-17 op case 0: /* success */
248 d3a08f4d 2021-01-17 op case -1: /* already handshaked */
250 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
251 d3a08f4d 2021-01-17 op fds->events = POLLIN;
253 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
254 d3a08f4d 2021-01-17 op fds->events = POLLOUT;
257 d3a08f4d 2021-01-17 op /* unreachable */
261 d3a08f4d 2021-01-17 op servname = tls_conn_servername(c->ctx);
263 d3a08f4d 2021-01-17 op for (h = hosts; h->domain != NULL; ++h) {
264 ce79c944 2021-01-21 op if (!strcmp(h->domain, "*"))
267 b4d409cf 2021-01-21 op if (servname != NULL && !fnmatch(h->domain, servname, 0))
271 d3a08f4d 2021-01-17 op if (h->domain != NULL) {
272 d3a08f4d 2021-01-17 op c->state = S_OPEN;
274 d3a08f4d 2021-01-17 op handle_open_conn(fds, c);
278 0ab65593 2021-01-21 op if (servname != NULL)
279 0ab65593 2021-01-21 op strncpy(c->req, servname, sizeof(c->req));
281 0ab65593 2021-01-21 op strncpy(c->req, "null", sizeof(c->req));
283 a87f6625 2021-01-24 op start_reply(fds, c, BAD_REQUEST, "Wrong host or missing SNI");
287 d3a08f4d 2021-01-17 op handle_open_conn(struct pollfd *fds, struct client *c)
289 d3a08f4d 2021-01-17 op const char *parse_err = "invalid request";
291 0be51733 2021-01-20 op bzero(c->req, sizeof(c->req));
292 0be51733 2021-01-20 op bzero(&c->iri, sizeof(c->iri));
294 0be51733 2021-01-20 op switch (tls_read(c->ctx, c->req, sizeof(c->req)-1)) {
296 d3a08f4d 2021-01-17 op LOGE(c, "tls_read: %s", tls_error(c->ctx));
297 36162ed8 2021-01-22 op close_conn(fds, c);
300 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
301 d3a08f4d 2021-01-17 op fds->events = POLLIN;
304 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
305 d3a08f4d 2021-01-17 op fds->events = POLLOUT;
309 0be51733 2021-01-20 op if (!trim_req_iri(c->req) || !parse_iri(c->req, &c->iri, &parse_err)) {
310 a87f6625 2021-01-24 op start_reply(fds, c, BAD_REQUEST, parse_err);
314 0be51733 2021-01-20 op /* XXX: we should check that the SNI matches the requested host */
315 0be51733 2021-01-20 op if (strcmp(c->iri.schema, "gemini") || c->iri.port_no != conf.port) {
316 a87f6625 2021-01-24 op start_reply(fds, c, PROXY_REFUSED, "won't proxy request");
320 0be51733 2021-01-20 op open_file(fds, c);
324 df79b4c1 2021-01-19 op start_reply(struct pollfd *pfd, struct client *c, int code, const char *meta)
326 05c23a54 2021-01-19 op char buf[1030]; /* status + ' ' + max reply len + \r\n\0 */
327 c8b74339 2021-01-24 op const char *lang;
330 df79b4c1 2021-01-19 op c->code = code;
331 df79b4c1 2021-01-19 op c->meta = meta;
332 df79b4c1 2021-01-19 op c->state = S_INITIALIZING;
334 c8b74339 2021-01-24 op lang = vhost_lang(c->host, c->iri.path);
336 05c23a54 2021-01-19 op snprintf(buf, sizeof(buf), "%d ", code);
337 df79b4c1 2021-01-19 op strlcat(buf, meta, sizeof(buf));
338 c8b74339 2021-01-24 op if (!strcmp(meta, "text/gemini") && lang != NULL) {
339 05c23a54 2021-01-19 op strlcat(buf, "; lang=", sizeof(buf));
340 c8b74339 2021-01-24 op strlcat(buf, lang, sizeof(buf));
343 05c23a54 2021-01-19 op len = strlcat(buf, "\r\n", sizeof(buf));
344 0be51733 2021-01-20 op assert(len < sizeof(buf));
346 df79b4c1 2021-01-19 op switch (tls_write(c->ctx, buf, len)) {
348 a87f6625 2021-01-24 op close_conn(pfd, c);
350 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
351 d3a08f4d 2021-01-17 op pfd->events = POLLIN;
353 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
354 d3a08f4d 2021-01-17 op pfd->events = POLLOUT;
358 a87f6625 2021-01-24 op log_request(c, buf, sizeof(buf));
360 a87f6625 2021-01-24 op /* we don't need a body */
361 a87f6625 2021-01-24 op if (c->code != SUCCESS) {
362 a87f6625 2021-01-24 op close_conn(pfd, c);
366 a87f6625 2021-01-24 op /* advance the state machine */
367 a87f6625 2021-01-24 op c->state = c->next;
368 a87f6625 2021-01-24 op handle(pfd, c);
372 d3a08f4d 2021-01-17 op start_cgi(const char *spath, const char *relpath, const char *query,
373 d3a08f4d 2021-01-17 op struct pollfd *fds, struct client *c)
375 d3a08f4d 2021-01-17 op char addr[NI_MAXHOST];
376 d3a08f4d 2021-01-17 op const char *ruser, *cissuer, *chash;
379 d3a08f4d 2021-01-17 op e = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
380 d3a08f4d 2021-01-17 op addr, sizeof(addr),
382 d3a08f4d 2021-01-17 op NI_NUMERICHOST);
386 d3a08f4d 2021-01-17 op if (tls_peer_cert_provided(c->ctx)) {
387 d3a08f4d 2021-01-17 op ruser = tls_peer_cert_subject(c->ctx);
388 d3a08f4d 2021-01-17 op cissuer = tls_peer_cert_issuer(c->ctx);
389 d3a08f4d 2021-01-17 op chash = tls_peer_cert_hash(c->ctx);
391 d3a08f4d 2021-01-17 op ruser = NULL;
392 d3a08f4d 2021-01-17 op cissuer = NULL;
393 d3a08f4d 2021-01-17 op chash = NULL;
396 d3a08f4d 2021-01-17 op if (!send_string(exfd, spath)
397 d3a08f4d 2021-01-17 op || !send_string(exfd, relpath)
398 d3a08f4d 2021-01-17 op || !send_string(exfd, query)
399 d3a08f4d 2021-01-17 op || !send_string(exfd, addr)
400 d3a08f4d 2021-01-17 op || !send_string(exfd, ruser)
401 d3a08f4d 2021-01-17 op || !send_string(exfd, cissuer)
402 d3a08f4d 2021-01-17 op || !send_string(exfd, chash)
403 d3a08f4d 2021-01-17 op || !send_vhost(exfd, c->host))
406 d3a08f4d 2021-01-17 op close(c->fd);
407 d3a08f4d 2021-01-17 op if ((c->fd = recv_fd(exfd)) == -1) {
408 a87f6625 2021-01-24 op start_reply(fds, c, TEMP_FAILURE, "internal server error");
411 a87f6625 2021-01-24 op c->state = S_SENDING_CGI;
412 d3a08f4d 2021-01-17 op cgi_poll_on_child(fds, c);
413 0be51733 2021-01-20 op c->code = -1;
414 d3a08f4d 2021-01-17 op /* handle_cgi(fds, c); */
418 d3a08f4d 2021-01-17 op /* fatal("cannot talk to the executor process: %s", strerror(errno)); */
419 132cae8c 2021-01-18 op fatal("cannot talk to the executor process");
423 0be51733 2021-01-20 op send_file(struct pollfd *fds, struct client *c)
425 d3a08f4d 2021-01-17 op ssize_t ret, len;
427 06f233ad 2021-01-21 op /* ensure the correct state */
428 a87f6625 2021-01-24 op c->state = S_SENDING_FILE;
430 d3a08f4d 2021-01-17 op len = (c->buf + c->len) - c->i;
432 d3a08f4d 2021-01-17 op while (len > 0) {
433 d3a08f4d 2021-01-17 op switch (ret = tls_write(c->ctx, c->i, len)) {
435 d3a08f4d 2021-01-17 op LOGE(c, "tls_write: %s", tls_error(c->ctx));
436 36162ed8 2021-01-22 op close_conn(fds, c);
439 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
440 d3a08f4d 2021-01-17 op fds->events = POLLIN;
443 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
444 d3a08f4d 2021-01-17 op fds->events = POLLOUT;
454 36162ed8 2021-01-22 op close_conn(fds, c);
458 252908e6 2021-01-24 op open_dir(struct pollfd *fds, struct client *c)
462 252908e6 2021-01-24 op char *before_file;
464 0be51733 2021-01-20 op len = strlen(c->iri.path);
465 252908e6 2021-01-24 op if (len > 0 && !ends_with(c->iri.path, "/")) {
466 252908e6 2021-01-24 op redirect_canonical_dir(fds, c);
470 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
471 d1ca3911 2021-01-21 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
472 d1ca3911 2021-01-21 op if (!ends_with(c->sbuf, "/"))
473 0be51733 2021-01-20 op strlcat(c->sbuf, "/", sizeof(c->sbuf));
474 252908e6 2021-01-24 op before_file = strchr(c->sbuf, '\0');
475 c8b74339 2021-01-24 op len = strlcat(c->sbuf, vhost_index(c->host, c->iri.path),
476 c8b74339 2021-01-24 op sizeof(c->sbuf));
477 252908e6 2021-01-24 op if (len >= sizeof(c->sbuf)) {
478 252908e6 2021-01-24 op start_reply(fds, c, TEMP_FAILURE, "internal server error");
482 252908e6 2021-01-24 op c->iri.path = c->sbuf;
484 252908e6 2021-01-24 op /* close later unless we have to generate the dir listing */
485 252908e6 2021-01-24 op dirfd = c->fd;
488 252908e6 2021-01-24 op switch (check_path(c, c->iri.path, &c->fd)) {
489 252908e6 2021-01-24 op case FILE_EXECUTABLE:
490 252908e6 2021-01-24 op if (starts_with(c->iri.path, c->host->cgi)) {
491 252908e6 2021-01-24 op start_cgi(c->iri.path, "", c->iri.query, fds, c);
495 252908e6 2021-01-24 op /* fallthrough */
497 252908e6 2021-01-24 op case FILE_EXISTS:
498 252908e6 2021-01-24 op load_file(fds, c);
501 252908e6 2021-01-24 op case FILE_DIRECTORY:
502 252908e6 2021-01-24 op start_reply(fds, c, TEMP_REDIRECT, c->sbuf);
505 252908e6 2021-01-24 op case FILE_MISSING:
506 252908e6 2021-01-24 op *before_file = '\0';
508 252908e6 2021-01-24 op if (!vhost_auto_index(c->host, c->iri.path)) {
509 252908e6 2021-01-24 op start_reply(fds, c, NOT_FOUND, "not found");
513 252908e6 2021-01-24 op c->fd = dirfd;
514 252908e6 2021-01-24 op c->next = S_SENDING_DIR;
516 252908e6 2021-01-24 op if ((c->dir = fdopendir(c->fd)) == NULL) {
517 252908e6 2021-01-24 op LOGE(c, "can't fdopendir(%d) (vhost:%s) %s: %s",
518 252908e6 2021-01-24 op c->fd, c->host->domain, c->iri.path, strerror(errno));
519 252908e6 2021-01-24 op start_reply(fds, c, TEMP_FAILURE, "internal server error");
524 252908e6 2021-01-24 op start_reply(fds, c, SUCCESS, "text/gemini");
528 252908e6 2021-01-24 op /* unreachable */
532 252908e6 2021-01-24 op close(dirfd);
536 252908e6 2021-01-24 op redirect_canonical_dir(struct pollfd *fds, struct client *c)
540 252908e6 2021-01-24 op strlcpy(c->sbuf, "/", sizeof(c->sbuf));
541 252908e6 2021-01-24 op strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
542 252908e6 2021-01-24 op len = strlcat(c->sbuf, "/", sizeof(c->sbuf));
544 0be51733 2021-01-20 op if (len >= sizeof(c->sbuf)) {
545 a87f6625 2021-01-24 op start_reply(fds, c, TEMP_FAILURE, "internal server error");
549 252908e6 2021-01-24 op start_reply(fds, c, TEMP_REDIRECT, c->sbuf);
553 252908e6 2021-01-24 op read_next_dir_entry(struct client *c)
555 252908e6 2021-01-24 op struct dirent *d;
559 252908e6 2021-01-24 op if ((d = readdir(c->dir)) == NULL) {
560 252908e6 2021-01-24 op if (errno != 0)
561 252908e6 2021-01-24 op LOGE(c, "readdir: %s", strerror(errno));
564 252908e6 2021-01-24 op } while (!strcmp(d->d_name, "."));
566 252908e6 2021-01-24 op /* XXX: url escape */
567 252908e6 2021-01-24 op snprintf(c->sbuf, sizeof(c->sbuf), "=> %s %s\n",
568 252908e6 2021-01-24 op d->d_name, d->d_name);
569 252908e6 2021-01-24 op c->len = strlen(c->sbuf);
576 252908e6 2021-01-24 op send_directory_listing(struct pollfd *fds, struct client *c)
581 252908e6 2021-01-24 op if (c->len == 0) {
582 252908e6 2021-01-24 op if (!read_next_dir_entry(c))
586 252908e6 2021-01-24 op while (c->len > 0) {
587 252908e6 2021-01-24 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
591 252908e6 2021-01-24 op case TLS_WANT_POLLOUT:
592 252908e6 2021-01-24 op fds->events = POLLOUT;
595 252908e6 2021-01-24 op case TLS_WANT_POLLIN:
596 252908e6 2021-01-24 op fds->events = POLLIN;
608 252908e6 2021-01-24 op close_conn(fds, c);
612 d3a08f4d 2021-01-17 op cgi_poll_on_child(struct pollfd *fds, struct client *c)
616 d3a08f4d 2021-01-17 op if (c->waiting_on_child)
618 d3a08f4d 2021-01-17 op c->waiting_on_child = 1;
620 d3a08f4d 2021-01-17 op fds->events = POLLIN;
622 d3a08f4d 2021-01-17 op fd = fds->fd;
623 d3a08f4d 2021-01-17 op fds->fd = c->fd;
628 d3a08f4d 2021-01-17 op cgi_poll_on_client(struct pollfd *fds, struct client *c)
632 d3a08f4d 2021-01-17 op if (!c->waiting_on_child)
634 d3a08f4d 2021-01-17 op c->waiting_on_child = 0;
636 d3a08f4d 2021-01-17 op fd = fds->fd;
637 d3a08f4d 2021-01-17 op fds->fd = c->fd;
641 3309ef97 2021-01-23 op /* handle the read from the child process. Return like read(2) */
642 3309ef97 2021-01-23 op static ssize_t
643 3309ef97 2021-01-23 op read_from_cgi(struct client *c)
649 3309ef97 2021-01-23 op /* if we haven't read a whole response line, we want to
650 3309ef97 2021-01-23 op * continue reading. */
652 3309ef97 2021-01-23 op if (c->code == -1) {
653 3309ef97 2021-01-23 op buf = c->sbuf + c->len;
654 3309ef97 2021-01-23 op len = sizeof(c->sbuf) - c->len;
656 3309ef97 2021-01-23 op buf = c->sbuf;
657 3309ef97 2021-01-23 op len = sizeof(c->sbuf);
660 3309ef97 2021-01-23 op r = read(c->fd, buf, len);
661 3309ef97 2021-01-23 op if (r == 0 || r == -1)
667 3309ef97 2021-01-23 op if (c->code != -1)
670 3309ef97 2021-01-23 op if (strchr(c->sbuf, '\n') || c->len == sizeof(c->sbuf)) {
672 3309ef97 2021-01-23 op log_request(c, c->sbuf, c->len);
679 d3a08f4d 2021-01-17 op handle_cgi(struct pollfd *fds, struct client *c)
683 d3a08f4d 2021-01-17 op /* ensure c->fd is the child and fds->fd the client */
684 d3a08f4d 2021-01-17 op cgi_poll_on_client(fds, c);
687 3309ef97 2021-01-23 op if (c->code == -1 || c->len == 0) {
688 3309ef97 2021-01-23 op switch (r = read_from_cgi(c)) {
693 d3a08f4d 2021-01-17 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
694 d3a08f4d 2021-01-17 op cgi_poll_on_child(fds, c);
701 3309ef97 2021-01-23 op if (c->code == -1) {
702 3309ef97 2021-01-23 op cgi_poll_on_child(fds, c);
706 d3a08f4d 2021-01-17 op while (c->len > 0) {
707 d3a08f4d 2021-01-17 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
711 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
712 d3a08f4d 2021-01-17 op fds->events = POLLOUT;
715 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
716 d3a08f4d 2021-01-17 op fds->events = POLLIN;
728 36162ed8 2021-01-22 op close_conn(fds, c);
732 36162ed8 2021-01-22 op close_conn(struct pollfd *pfd, struct client *c)
734 d3a08f4d 2021-01-17 op c->state = S_CLOSING;
736 d3a08f4d 2021-01-17 op switch (tls_close(c->ctx)) {
737 d3a08f4d 2021-01-17 op case TLS_WANT_POLLIN:
738 d3a08f4d 2021-01-17 op pfd->events = POLLIN;
740 d3a08f4d 2021-01-17 op case TLS_WANT_POLLOUT:
741 d3a08f4d 2021-01-17 op pfd->events = POLLOUT;
745 d3a08f4d 2021-01-17 op connected_clients--;
747 d3a08f4d 2021-01-17 op tls_free(c->ctx);
748 d3a08f4d 2021-01-17 op c->ctx = NULL;
750 d3a08f4d 2021-01-17 op if (c->buf != MAP_FAILED)
751 d3a08f4d 2021-01-17 op munmap(c->buf, c->len);
753 d3a08f4d 2021-01-17 op if (c->fd != -1)
754 d3a08f4d 2021-01-17 op close(c->fd);
756 252908e6 2021-01-24 op if (c->dir != NULL)
757 252908e6 2021-01-24 op closedir(c->dir);
759 d3a08f4d 2021-01-17 op close(pfd->fd);
760 d3a08f4d 2021-01-17 op pfd->fd = -1;
764 d3a08f4d 2021-01-17 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
767 d3a08f4d 2021-01-17 op struct sockaddr_storage addr;
768 d3a08f4d 2021-01-17 op socklen_t len;
770 d3a08f4d 2021-01-17 op len = sizeof(addr);
771 d3a08f4d 2021-01-17 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
772 d3a08f4d 2021-01-17 op if (errno == EWOULDBLOCK)
774 d3a08f4d 2021-01-17 op fatal("accept: %s", strerror(errno));
777 d3a08f4d 2021-01-17 op mark_nonblock(fd);
779 d3a08f4d 2021-01-17 op for (i = 0; i < MAX_USERS; ++i) {
780 d3a08f4d 2021-01-17 op if (fds[i].fd == -1) {
781 d3a08f4d 2021-01-17 op bzero(&clients[i], sizeof(struct client));
782 d3a08f4d 2021-01-17 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
783 d3a08f4d 2021-01-17 op break; /* goodbye fd! */
785 d3a08f4d 2021-01-17 op fds[i].fd = fd;
786 d3a08f4d 2021-01-17 op fds[i].events = POLLIN;
788 d3a08f4d 2021-01-17 op clients[i].state = S_HANDSHAKE;
789 a87f6625 2021-01-24 op clients[i].next = S_SENDING_FILE;
790 d3a08f4d 2021-01-17 op clients[i].fd = -1;
791 d3a08f4d 2021-01-17 op clients[i].waiting_on_child = 0;
792 d3a08f4d 2021-01-17 op clients[i].buf = MAP_FAILED;
793 252908e6 2021-01-24 op clients[i].dir = NULL;
794 d3a08f4d 2021-01-17 op clients[i].addr = addr;
796 d3a08f4d 2021-01-17 op connected_clients++;
805 d3a08f4d 2021-01-17 op handle(struct pollfd *fds, struct client *client)
807 d3a08f4d 2021-01-17 op switch (client->state) {
808 d3a08f4d 2021-01-17 op case S_HANDSHAKE:
809 d3a08f4d 2021-01-17 op handle_handshake(fds, client);
813 d3a08f4d 2021-01-17 op handle_open_conn(fds, client);
816 d3a08f4d 2021-01-17 op case S_INITIALIZING:
817 a87f6625 2021-01-24 op start_reply(fds, client, client->code, client->meta);
820 a87f6625 2021-01-24 op case S_SENDING_FILE:
821 a87f6625 2021-01-24 op send_file(fds, client);
824 252908e6 2021-01-24 op case S_SENDING_DIR:
825 252908e6 2021-01-24 op send_directory_listing(fds, client);
828 a87f6625 2021-01-24 op case S_SENDING_CGI:
829 a87f6625 2021-01-24 op handle_cgi(fds, client);
832 d3a08f4d 2021-01-17 op case S_CLOSING:
833 36162ed8 2021-01-22 op close_conn(fds, client);
837 d3a08f4d 2021-01-17 op /* unreachable */
843 d3a08f4d 2021-01-17 op loop(struct tls *ctx, int sock4, int sock6)
846 d3a08f4d 2021-01-17 op struct client clients[MAX_USERS];
847 d3a08f4d 2021-01-17 op struct pollfd fds[MAX_USERS];
849 d3a08f4d 2021-01-17 op connected_clients = 0;
851 d3a08f4d 2021-01-17 op for (i = 0; i < MAX_USERS; ++i) {
852 d3a08f4d 2021-01-17 op fds[i].fd = -1;
853 d3a08f4d 2021-01-17 op fds[i].events = POLLIN;
854 d3a08f4d 2021-01-17 op bzero(&clients[i], sizeof(struct client));
857 d3a08f4d 2021-01-17 op fds[0].fd = sock4;
858 d3a08f4d 2021-01-17 op fds[1].fd = sock6;
861 d3a08f4d 2021-01-17 op if (poll(fds, MAX_USERS, INFTIM) == -1) {
862 d3a08f4d 2021-01-17 op if (errno == EINTR) {
863 132cae8c 2021-01-18 op fprintf(stderr, "connected clients: %d\n",
864 d3a08f4d 2021-01-17 op connected_clients);
867 d3a08f4d 2021-01-17 op fatal("poll: %s", strerror(errno));
870 d3a08f4d 2021-01-17 op for (i = 0; i < MAX_USERS; i++) {
871 d3a08f4d 2021-01-17 op if (fds[i].revents == 0)
874 d3a08f4d 2021-01-17 op if (fds[i].revents & (POLLERR|POLLNVAL))
875 d3a08f4d 2021-01-17 op fatal("bad fd %d: %s", fds[i].fd,
876 d3a08f4d 2021-01-17 op strerror(errno));
878 d3a08f4d 2021-01-17 op if (fds[i].revents & POLLHUP) {
879 d3a08f4d 2021-01-17 op /* fds[i] may be the fd of the stdin
880 d3a08f4d 2021-01-17 op * of a cgi script that has exited. */
881 d3a08f4d 2021-01-17 op if (!clients[i].waiting_on_child) {
882 36162ed8 2021-01-22 op close_conn(&fds[i], &clients[i]);
887 d3a08f4d 2021-01-17 op if (fds[i].fd == sock4)
888 d3a08f4d 2021-01-17 op do_accept(sock4, ctx, fds, clients);
889 d3a08f4d 2021-01-17 op else if (fds[i].fd == sock6)
890 d3a08f4d 2021-01-17 op do_accept(sock6, ctx, fds, clients);
892 d3a08f4d 2021-01-17 op handle(&fds[i], &clients[i]);