2 3e4749f7 2020-10-02 op * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
4 3e4749f7 2020-10-02 op * Permission to use, copy, modify, and distribute this software for any
5 3e4749f7 2020-10-02 op * purpose with or without fee is hereby granted, provided that the above
6 3e4749f7 2020-10-02 op * copyright notice and this permission notice appear in all copies.
8 3e4749f7 2020-10-02 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 3e4749f7 2020-10-02 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 3e4749f7 2020-10-02 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 3e4749f7 2020-10-02 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 3e4749f7 2020-10-02 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 3e4749f7 2020-10-02 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 3e4749f7 2020-10-02 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 f28f9311 2020-10-14 op #include <sys/mman.h>
18 3e4749f7 2020-10-02 op #include <sys/socket.h>
19 3e4749f7 2020-10-02 op #include <sys/stat.h>
21 2c3a40fa 2020-11-06 op #include <arpa/inet.h>
22 3e4749f7 2020-10-02 op #include <netinet/in.h>
24 3e4749f7 2020-10-02 op #include <assert.h>
25 3e4749f7 2020-10-02 op #include <err.h>
26 592fd624 2020-10-07 op #include <errno.h>
27 3e4749f7 2020-10-02 op #include <fcntl.h>
28 592fd624 2020-10-07 op #include <poll.h>
29 0cf902af 2020-11-03 op #include <signal.h>
30 3e4749f7 2020-10-02 op #include <stdio.h>
31 3e4749f7 2020-10-02 op #include <stdlib.h>
32 3e4749f7 2020-10-02 op #include <string.h>
33 3e4749f7 2020-10-02 op #include <tls.h>
34 3e4749f7 2020-10-02 op #include <unistd.h>
36 3e4749f7 2020-10-02 op #ifndef __OpenBSD__
37 3e4749f7 2020-10-02 op # define pledge(a, b) 0
38 3e4749f7 2020-10-02 op # define unveil(a, b) 0
39 3e4749f7 2020-10-02 op #endif /* __OpenBSD__ */
41 592fd624 2020-10-07 op #ifndef INFTIM
42 592fd624 2020-10-07 op # define INFTIM -1
43 592fd624 2020-10-07 op #endif /* INFTIM */
45 3e4749f7 2020-10-02 op #define GEMINI_URL_LEN (1024+3) /* URL max len + \r\n + \0 */
47 4d4f0e19 2020-10-03 op /* large enough to hold a copy of a gemini URL and still have extra room */
48 d95b77a0 2020-10-07 op #define PATHBUF 2048
50 3e4749f7 2020-10-02 op #define SUCCESS 20
51 72342dc9 2020-11-06 op #define TEMP_FAILURE 40
52 3e4749f7 2020-10-02 op #define NOT_FOUND 51
53 3e4749f7 2020-10-02 op #define BAD_REQUEST 59
55 592fd624 2020-10-07 op #ifndef MAX_USERS
56 592fd624 2020-10-07 op #define MAX_USERS 64
61 592fd624 2020-10-07 op S_INITIALIZING,
66 592fd624 2020-10-07 op struct client {
67 592fd624 2020-10-07 op struct tls *ctx;
70 592fd624 2020-10-07 op const char *meta;
71 aff8d190 2020-11-06 op int fd, waiting_on_child;
73 aff8d190 2020-11-06 op char sbuf[1024]; /* static buffer */
74 aff8d190 2020-11-06 op void *buf, *i; /* mmap buffer */
75 aff8d190 2020-11-06 op ssize_t len, off; /* mmap/static buffer */
77 2c3a40fa 2020-11-06 op struct in_addr addr;
82 a5d310bc 2020-11-10 op FILE_EXECUTABLE,
83 a5d310bc 2020-11-10 op FILE_DIRECTORY,
87 cc68fe70 2020-10-07 op struct etm { /* file extension to mime */
88 cc68fe70 2020-10-07 op const char *mime;
89 cc68fe70 2020-10-07 op const char *ext;
90 cc68fe70 2020-10-07 op } filetypes[] = {
91 cc68fe70 2020-10-07 op {"application/pdf", "pdf"},
93 cc68fe70 2020-10-07 op {"image/gif", "gif"},
94 cc68fe70 2020-10-07 op {"image/jpeg", "jpg"},
95 cc68fe70 2020-10-07 op {"image/jpeg", "jpeg"},
96 cc68fe70 2020-10-07 op {"image/png", "png"},
97 cc68fe70 2020-10-07 op {"image/svg+xml", "svg"},
99 cc68fe70 2020-10-07 op {"text/gemini", "gemini"},
100 cc68fe70 2020-10-07 op {"text/gemini", "gmi"},
101 cc68fe70 2020-10-07 op {"text/markdown", "markdown"},
102 cc68fe70 2020-10-07 op {"text/markdown", "md"},
103 cc68fe70 2020-10-07 op {"text/plain", "txt"},
104 932b001a 2020-11-06 op {"text/xml", "xml"},
109 2c3a40fa 2020-11-06 op #define LOG(c, fmt, ...) \
111 2c3a40fa 2020-11-06 op char buf[INET_ADDRSTRLEN]; \
112 2c3a40fa 2020-11-06 op if (inet_ntop((c)->af, &(c)->addr, buf, sizeof(buf)) == NULL) \
113 2c3a40fa 2020-11-06 op err(1, "inet_ntop"); \
114 2c3a40fa 2020-11-06 op dprintf(logfd, "[%s] " fmt "\n", buf, __VA_ARGS__); \
117 72f653b6 2020-11-06 op const char *dir, *cgi;
118 2c3a40fa 2020-11-06 op int dirfd, logfd;
119 120381c9 2020-11-06 op int connected_clients;
121 120381c9 2020-11-06 op void siginfo_handler(int);
122 72f653b6 2020-11-06 op int starts_with(const char*, const char*);
124 592fd624 2020-10-07 op char *url_after_proto(char*);
125 592fd624 2020-10-07 op char *url_start_of_request(char*);
126 2c3a40fa 2020-11-06 op int url_trim(struct client*, char*);
127 aa0fe0cf 2020-11-06 op char *adjust_path(char*);
128 f28f9311 2020-10-14 op ssize_t filesize(int);
130 592fd624 2020-10-07 op int start_reply(struct pollfd*, struct client*, int, const char*);
131 cc68fe70 2020-10-07 op const char *path_ext(const char*);
132 cc68fe70 2020-10-07 op const char *mime(const char*);
133 a5d310bc 2020-11-10 op int check_path(const char*, int*);
134 a5d310bc 2020-11-10 op int check_for_cgi(char *, char*, struct pollfd*, struct client*);
135 75d233f0 2020-11-06 op int open_file(char*, char*, struct pollfd*, struct client*);
136 a5d310bc 2020-11-10 op int start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
137 aff8d190 2020-11-06 op void cgi_setpoll_on_child(struct pollfd*, struct client*);
138 aff8d190 2020-11-06 op void cgi_setpoll_on_client(struct pollfd*, struct client*);
139 72342dc9 2020-11-06 op void handle_cgi(struct pollfd*, struct client*);
140 75d233f0 2020-11-06 op void send_file(char*, char*, struct pollfd*, struct client*);
141 592fd624 2020-10-07 op void send_dir(char*, struct pollfd*, struct client*);
142 592fd624 2020-10-07 op void handle(struct pollfd*, struct client*);
144 592fd624 2020-10-07 op void mark_nonblock(int);
145 592fd624 2020-10-07 op int make_soket(int);
146 592fd624 2020-10-07 op void do_accept(int, struct tls*, struct pollfd*, struct client*);
147 592fd624 2020-10-07 op void goodbye(struct pollfd*, struct client*);
148 592fd624 2020-10-07 op void loop(struct tls*, int);
150 592fd624 2020-10-07 op void usage(const char*);
153 120381c9 2020-11-06 op siginfo_handler(int sig)
159 72f653b6 2020-11-06 op starts_with(const char *str, const char *prefix)
163 72f653b6 2020-11-06 op for (i = 0; prefix[i] != '\0'; ++i)
164 72f653b6 2020-11-06 op if (str[i] != prefix[i])
170 3e4749f7 2020-10-02 op url_after_proto(char *url)
173 3e4749f7 2020-10-02 op const char *proto = "gemini";
174 3e4749f7 2020-10-02 op const char *marker = "://";
176 3c19febb 2020-11-06 op /* a relative URL */
177 3e4749f7 2020-10-02 op if ((s = strstr(url, marker)) == NULL)
180 3c19febb 2020-11-06 op if (s - strlen(proto) != url)
183 72f653b6 2020-11-06 op if (!starts_with(url, proto))
186 3e4749f7 2020-10-02 op /* a valid gemini:// URL */
187 3e4749f7 2020-10-02 op return s + strlen(marker);
191 3e4749f7 2020-10-02 op url_start_of_request(char *url)
195 3e4749f7 2020-10-02 op if ((s = url_after_proto(url)) == NULL)
198 3e4749f7 2020-10-02 op if ((t = strstr(s, "/")) == NULL)
199 3e4749f7 2020-10-02 op return s + strlen(s);
204 2c3a40fa 2020-11-06 op url_trim(struct client *c, char *url)
206 3e4749f7 2020-10-02 op const char *e = "\r\n";
209 3e4749f7 2020-10-02 op if ((s = strstr(url, e)) == NULL)
214 3e4749f7 2020-10-02 op if (s[2] != '\0') {
215 2c3a40fa 2020-11-06 op LOG(c, "%s", "request longer than 1024 bytes\n");
223 3e4749f7 2020-10-02 op adjust_path(char *path)
225 aa0fe0cf 2020-11-06 op char *s, *query;
228 aa0fe0cf 2020-11-06 op if ((query = strchr(path, '?')) != NULL) {
229 aa0fe0cf 2020-11-06 op *query = '\0';
233 f28f9311 2020-10-14 op /* /.. -> / */
234 3e4749f7 2020-10-02 op len = strlen(path);
235 3e4749f7 2020-10-02 op if (len >= 3) {
236 3e4749f7 2020-10-02 op if (!strcmp(&path[len-3], "/..")) {
237 3e4749f7 2020-10-02 op path[len-2] = '\0';
241 3e4749f7 2020-10-02 op /* if the path is only `..` trim out and exit */
242 3e4749f7 2020-10-02 op if (!strcmp(path, "..")) {
243 3e4749f7 2020-10-02 op path[0] = '\0';
244 aa0fe0cf 2020-11-06 op return query;
247 3e4749f7 2020-10-02 op /* remove every ../ in the path */
249 3e4749f7 2020-10-02 op if ((s = strstr(path, "../")) == NULL)
250 aa0fe0cf 2020-11-06 op return query;
251 67328d23 2020-10-03 op memmove(s, s+3, strlen(s)+1); /* copy also the \0 */
256 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
258 3e4749f7 2020-10-02 op char buf[1030] = {0}; /* status + ' ' + max reply len + \r\n\0 */
262 592fd624 2020-10-07 op client->code = code;
263 592fd624 2020-10-07 op client->meta = reason;
264 592fd624 2020-10-07 op client->state = S_INITIALIZING;
266 3e4749f7 2020-10-02 op len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
267 3e4749f7 2020-10-02 op assert(len < (int)sizeof(buf));
268 592fd624 2020-10-07 op ret = tls_write(client->ctx, buf, len);
269 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
270 592fd624 2020-10-07 op pfd->events = POLLIN;
274 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
275 592fd624 2020-10-07 op pfd->events = POLLOUT;
283 f28f9311 2020-10-14 op filesize(int fd)
287 f28f9311 2020-10-14 op if ((len = lseek(fd, 0, SEEK_END)) == -1)
289 f28f9311 2020-10-14 op if (lseek(fd, 0, SEEK_SET) == -1)
295 cc68fe70 2020-10-07 op path_ext(const char *path)
297 cc68fe70 2020-10-07 op const char *end;
299 cc68fe70 2020-10-07 op end = path + strlen(path)-1; /* the last byte before the NUL */
300 cc68fe70 2020-10-07 op for (; end != path; --end) {
301 cc68fe70 2020-10-07 op if (*end == '.')
302 cc68fe70 2020-10-07 op return end+1;
303 cc68fe70 2020-10-07 op if (*end == '/')
311 cc68fe70 2020-10-07 op mime(const char *path)
313 cc68fe70 2020-10-07 op const char *ext, *def = "application/octet-stream";
314 cc68fe70 2020-10-07 op struct etm *t;
316 cc68fe70 2020-10-07 op if ((ext = path_ext(path)) == NULL)
319 cc68fe70 2020-10-07 op for (t = filetypes; t->mime != NULL; ++t)
320 cc68fe70 2020-10-07 op if (!strcmp(ext, t->ext))
321 cc68fe70 2020-10-07 op return t->mime;
327 a5d310bc 2020-11-10 op check_path(const char *path, int *fd)
329 72342dc9 2020-11-06 op struct stat sb;
331 f28f9311 2020-10-14 op assert(path != NULL);
332 a5d310bc 2020-11-10 op if ((*fd = openat(dirfd, path,
333 a5d310bc 2020-11-10 op O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
334 a5d310bc 2020-11-10 op return FILE_MISSING;
337 a5d310bc 2020-11-10 op if (fstat(*fd, &sb) == -1) {
338 a5d310bc 2020-11-10 op dprintf(logfd, "failed stat for %s\n", path);
339 a5d310bc 2020-11-10 op return FILE_MISSING;
342 a5d310bc 2020-11-10 op if (S_ISDIR(sb.st_mode))
343 a5d310bc 2020-11-10 op return FILE_DIRECTORY;
345 a5d310bc 2020-11-10 op if (sb.st_mode & S_IXUSR)
346 a5d310bc 2020-11-10 op return FILE_EXECUTABLE;
348 a5d310bc 2020-11-10 op return FILE_EXISTS;
352 a5d310bc 2020-11-10 op * the inverse of this algorithm, i.e. starting from the start of the
353 a5d310bc 2020-11-10 op * path + strlen(cgi), and checking if each component, should be
354 a5d310bc 2020-11-10 op * faster. But it's tedious to write. This does the opposite: starts
355 a5d310bc 2020-11-10 op * from the end and strip one component at a time, until either an
356 a5d310bc 2020-11-10 op * executable is found or we emptied the path.
359 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
362 a5d310bc 2020-11-10 op end = strchr(path, '\0');
364 a5d310bc 2020-11-10 op /* NB: assume CGI is enabled and path matches cgi */
366 a5d310bc 2020-11-10 op while (end > path) {
367 a5d310bc 2020-11-10 op /* go up one level. UNIX paths are simple and POSIX
368 a5d310bc 2020-11-10 op * dirname, with its ambiguities on if the given path
369 a5d310bc 2020-11-10 op * is changed or not, gives me headaches. */
370 a5d310bc 2020-11-10 op while (*end != '/')
374 a5d310bc 2020-11-10 op switch (check_path(path, &c->fd)) {
375 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
376 a5d310bc 2020-11-10 op return start_cgi(path, end+1, query, fds,c);
377 a5d310bc 2020-11-10 op case FILE_MISSING:
388 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
390 a5d310bc 2020-11-10 op goodbye(fds, c);
396 a5d310bc 2020-11-10 op open_file(char *path, char *query, struct pollfd *fds, struct client *c)
398 a5d310bc 2020-11-10 op char fpath[PATHBUF];
400 f28f9311 2020-10-14 op bzero(fpath, sizeof(fpath));
402 f28f9311 2020-10-14 op if (*path != '.')
403 f28f9311 2020-10-14 op fpath[0] = '.';
404 f28f9311 2020-10-14 op strlcat(fpath, path, PATHBUF);
406 a5d310bc 2020-11-10 op switch (check_path(fpath, &c->fd)) {
407 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
408 a5d310bc 2020-11-10 op /* +2 to skip the ./ */
409 a5d310bc 2020-11-10 op if (cgi != NULL && starts_with(fpath+2, cgi))
410 a5d310bc 2020-11-10 op return start_cgi(fpath, "", query, fds, c);
412 a5d310bc 2020-11-10 op /* fallthrough */
414 a5d310bc 2020-11-10 op case FILE_EXISTS:
415 a5d310bc 2020-11-10 op if ((c->len = filesize(c->fd)) == -1) {
416 a5d310bc 2020-11-10 op LOG(c, "failed to get file size for %s", fpath);
417 a5d310bc 2020-11-10 op goodbye(fds, c);
421 a5d310bc 2020-11-10 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
422 a5d310bc 2020-11-10 op c->fd, 0)) == MAP_FAILED) {
423 a5d310bc 2020-11-10 op warn("mmap: %s", fpath);
424 a5d310bc 2020-11-10 op goodbye(fds, c);
427 a5d310bc 2020-11-10 op c->i = c->buf;
428 a5d310bc 2020-11-10 op return start_reply(fds, c, SUCCESS, mime(fpath));
430 a5d310bc 2020-11-10 op case FILE_DIRECTORY:
431 2c3a40fa 2020-11-06 op LOG(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
432 f28f9311 2020-10-14 op close(c->fd);
434 f28f9311 2020-10-14 op send_dir(fpath, fds, c);
437 a5d310bc 2020-11-10 op case FILE_MISSING:
438 a5d310bc 2020-11-10 op if (cgi != NULL && starts_with(fpath+2, cgi))
439 a5d310bc 2020-11-10 op return check_for_cgi(fpath, query, fds, c);
441 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
443 f28f9311 2020-10-14 op goodbye(fds, c);
447 a5d310bc 2020-11-10 op /* unreachable */
453 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
454 75d233f0 2020-11-06 op struct pollfd *fds, struct client *c)
457 a5d310bc 2020-11-10 op int p[2]; /* read end, write end */
459 72342dc9 2020-11-06 op if (pipe(p) == -1)
462 72342dc9 2020-11-06 op switch (pid = fork()) {
466 a5d310bc 2020-11-10 op case 0: { /* child */
467 a5d310bc 2020-11-10 op char *ex, *requri;
468 72342dc9 2020-11-06 op char addr[INET_ADDRSTRLEN];
469 72342dc9 2020-11-06 op char *argv[] = { NULL, NULL, NULL };
474 72342dc9 2020-11-06 op if (dup2(p[1], 1) == -1)
475 72342dc9 2020-11-06 op goto childerr;
477 72342dc9 2020-11-06 op if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
478 a5d310bc 2020-11-10 op goto childerr;
480 a5d310bc 2020-11-10 op if (asprintf(&ex, "%s%s", dir, spath+1) == -1)
481 72342dc9 2020-11-06 op goto childerr;
483 a5d310bc 2020-11-10 op if (asprintf(&requri, "%s%s%s", spath,
484 a5d310bc 2020-11-10 op *relpath == '\0' ? "" : "/",
485 a5d310bc 2020-11-10 op relpath) == -1)
486 a5d310bc 2020-11-10 op goto childerr;
488 a5d310bc 2020-11-10 op argv[0] = argv[1] = ex;
490 60ba426e 2020-11-06 op /* fix the env */
491 60ba426e 2020-11-06 op setenv("SERVER_SOFTWARE", "gmid", 1);
492 60ba426e 2020-11-06 op setenv("SERVER_PORT", "1965", 1);
493 a5d310bc 2020-11-10 op /* setenv("SERVER_NAME", "", 1); */
494 a5d310bc 2020-11-10 op setenv("SCRIPT_NAME", spath, 1);
495 a5d310bc 2020-11-10 op setenv("SCRIPT_EXECUTABLE", ex, 1);
496 a5d310bc 2020-11-10 op setenv("REQUEST_URI", requri, 1);
497 a5d310bc 2020-11-10 op setenv("REQUEST_RELATIVE", relpath, 1);
498 f65ed018 2020-11-06 op if (query != NULL)
499 f65ed018 2020-11-06 op setenv("QUERY_STRING", query, 1);
500 a5d310bc 2020-11-10 op setenv("REMOTE_HOST", addr, 1);
501 a5d310bc 2020-11-10 op setenv("DOCUMENT_ROOT", dir, 1);
503 a5d310bc 2020-11-10 op execvp(ex, argv);
504 72342dc9 2020-11-06 op goto childerr;
507 72342dc9 2020-11-06 op default: /* parent */
509 72342dc9 2020-11-06 op close(c->fd);
510 72342dc9 2020-11-06 op c->fd = p[0];
511 72342dc9 2020-11-06 op c->child = pid;
512 aff8d190 2020-11-06 op mark_nonblock(c->fd);
513 aff8d190 2020-11-06 op c->state = S_SENDING;
514 72342dc9 2020-11-06 op handle_cgi(fds, c);
519 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
521 72342dc9 2020-11-06 op goodbye(fds, c);
525 72342dc9 2020-11-06 op dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
531 aff8d190 2020-11-06 op cgi_setpoll_on_child(struct pollfd *fds, struct client *c)
535 aff8d190 2020-11-06 op if (c->waiting_on_child)
537 aff8d190 2020-11-06 op c->waiting_on_child = 1;
539 aff8d190 2020-11-06 op fds->events = POLLIN;
541 aff8d190 2020-11-06 op fd = fds->fd;
542 aff8d190 2020-11-06 op fds->fd = c->fd;
547 aff8d190 2020-11-06 op cgi_setpoll_on_client(struct pollfd *fds, struct client *c)
551 aff8d190 2020-11-06 op if (!c->waiting_on_child)
553 aff8d190 2020-11-06 op c->waiting_on_child = 0;
555 aff8d190 2020-11-06 op fd = fds->fd;
556 aff8d190 2020-11-06 op fds->fd = c->fd;
561 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
565 aff8d190 2020-11-06 op /* ensure c->fd is the child and fds->fd the client */
566 aff8d190 2020-11-06 op cgi_setpoll_on_client(fds, c);
569 aff8d190 2020-11-06 op if (c->len == 0) {
570 aff8d190 2020-11-06 op if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
572 aff8d190 2020-11-06 op if (r == -1) {
573 aff8d190 2020-11-06 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
574 aff8d190 2020-11-06 op cgi_setpoll_on_child(fds, c);
583 aff8d190 2020-11-06 op while (c->len > 0) {
584 aff8d190 2020-11-06 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
588 72342dc9 2020-11-06 op case TLS_WANT_POLLOUT:
589 aff8d190 2020-11-06 op fds->events = POLLOUT;
592 72342dc9 2020-11-06 op case TLS_WANT_POLLIN:
593 aff8d190 2020-11-06 op fds->events = POLLIN;
605 72342dc9 2020-11-06 op goodbye(fds, c);
609 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
611 f28f9311 2020-10-14 op ssize_t ret, len;
613 f28f9311 2020-10-14 op if (c->fd == -1) {
614 75d233f0 2020-11-06 op if (!open_file(path, query, fds, c))
616 f28f9311 2020-10-14 op c->state = S_SENDING;
619 f28f9311 2020-10-14 op len = (c->buf + c->len) - c->i;
621 f28f9311 2020-10-14 op while (len > 0) {
622 f28f9311 2020-10-14 op switch (ret = tls_write(c->ctx, c->i, len)) {
624 2c3a40fa 2020-11-06 op LOG(c, "tls_write: %s", tls_error(c->ctx));
625 f28f9311 2020-10-14 op goodbye(fds, c);
628 f28f9311 2020-10-14 op case TLS_WANT_POLLIN:
629 f28f9311 2020-10-14 op fds->events = POLLIN;
632 f28f9311 2020-10-14 op case TLS_WANT_POLLOUT:
633 f28f9311 2020-10-14 op fds->events = POLLOUT;
643 f28f9311 2020-10-14 op goodbye(fds, c);
647 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
649 3e4749f7 2020-10-02 op char fpath[PATHBUF];
652 3e4749f7 2020-10-02 op bzero(fpath, PATHBUF);
654 9c56b0a7 2020-10-14 op if (path[0] != '.')
655 3e4749f7 2020-10-02 op fpath[0] = '.';
657 3e4749f7 2020-10-02 op /* this cannot fail since sizeof(fpath) > maxlen of path */
658 3e4749f7 2020-10-02 op strlcat(fpath, path, PATHBUF);
659 3e4749f7 2020-10-02 op len = strlen(fpath);
661 3e4749f7 2020-10-02 op /* add a trailing / in case. */
662 3e4749f7 2020-10-02 op if (fpath[len-1] != '/') {
663 3e4749f7 2020-10-02 op fpath[len] = '/';
666 3e4749f7 2020-10-02 op strlcat(fpath, "index.gmi", sizeof(fpath));
668 75d233f0 2020-11-06 op send_file(fpath, NULL, fds, client);
672 592fd624 2020-10-07 op handle(struct pollfd *fds, struct client *client)
674 592fd624 2020-10-07 op char buf[GEMINI_URL_LEN];
678 592fd624 2020-10-07 op switch (client->state) {
680 592fd624 2020-10-07 op bzero(buf, GEMINI_URL_LEN);
681 592fd624 2020-10-07 op switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
683 2c3a40fa 2020-11-06 op LOG(client, "tls_read: %s", tls_error(client->ctx));
684 592fd624 2020-10-07 op goodbye(fds, client);
687 592fd624 2020-10-07 op case TLS_WANT_POLLIN:
688 592fd624 2020-10-07 op fds->events = POLLIN;
691 592fd624 2020-10-07 op case TLS_WANT_POLLOUT:
692 592fd624 2020-10-07 op fds->events = POLLOUT;
696 2c3a40fa 2020-11-06 op if (!url_trim(client, buf)) {
697 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
699 592fd624 2020-10-07 op goodbye(fds, client);
703 592fd624 2020-10-07 op if ((path = url_start_of_request(buf)) == NULL) {
704 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
706 592fd624 2020-10-07 op goodbye(fds, client);
710 aa0fe0cf 2020-11-06 op query = adjust_path(path);
711 aa0fe0cf 2020-11-06 op LOG(client, "get %s%s%s", path,
712 aa0fe0cf 2020-11-06 op query ? "?" : "",
713 aa0fe0cf 2020-11-06 op query ? query : "");
715 a5d310bc 2020-11-10 op send_file(path, query, fds, client);
718 592fd624 2020-10-07 op case S_INITIALIZING:
719 592fd624 2020-10-07 op if (!start_reply(fds, client, client->code, client->meta))
722 592fd624 2020-10-07 op if (client->code != SUCCESS) {
723 592fd624 2020-10-07 op /* we don't need a body */
724 592fd624 2020-10-07 op goodbye(fds, client);
728 592fd624 2020-10-07 op client->state = S_SENDING;
730 592fd624 2020-10-07 op /* fallthrough */
732 592fd624 2020-10-07 op case S_SENDING:
733 aff8d190 2020-11-06 op if (client->child != -1)
734 aff8d190 2020-11-06 op handle_cgi(fds, client);
736 aff8d190 2020-11-06 op send_file(NULL, NULL, fds, client);
739 592fd624 2020-10-07 op case S_CLOSING:
740 592fd624 2020-10-07 op goodbye(fds, client);
744 592fd624 2020-10-07 op /* unreachable */
750 592fd624 2020-10-07 op mark_nonblock(int fd)
754 592fd624 2020-10-07 op if ((flags = fcntl(fd, F_GETFL)) == -1)
755 592fd624 2020-10-07 op err(1, "fcntl(F_GETFL)");
756 592fd624 2020-10-07 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
757 592fd624 2020-10-07 op err(1, "fcntl(F_SETFL)");
761 9468027b 2020-10-15 op make_socket(int port, int family)
764 9468027b 2020-10-15 op struct sockaddr_in addr4;
765 9468027b 2020-10-15 op struct sockaddr_in6 addr6;
766 9468027b 2020-10-15 op struct sockaddr *addr;
767 9468027b 2020-10-15 op socklen_t len;
769 9468027b 2020-10-15 op switch (family) {
770 9468027b 2020-10-15 op case AF_INET:
771 9468027b 2020-10-15 op bzero(&addr4, sizeof(addr4));
772 9468027b 2020-10-15 op addr4.sin_family = family;
773 9468027b 2020-10-15 op addr4.sin_port = htons(port);
774 9468027b 2020-10-15 op addr4.sin_addr.s_addr = INADDR_ANY;
775 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr4;
776 9468027b 2020-10-15 op len = sizeof(addr4);
779 9468027b 2020-10-15 op case AF_INET6:
780 9468027b 2020-10-15 op bzero(&addr6, sizeof(addr6));
781 9468027b 2020-10-15 op addr6.sin6_family = AF_INET6;
782 9468027b 2020-10-15 op addr6.sin6_port = htons(port);
783 9468027b 2020-10-15 op addr6.sin6_addr = in6addr_any;
784 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr6;
785 9468027b 2020-10-15 op len = sizeof(addr6);
789 9468027b 2020-10-15 op /* unreachable */
793 9468027b 2020-10-15 op if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
794 f28f9311 2020-10-14 op err(1, "socket");
797 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
798 3e4749f7 2020-10-02 op err(1, "setsockopt(SO_REUSEADDR)");
801 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
802 3e4749f7 2020-10-02 op err(1, "setsockopt(SO_REUSEPORT)");
804 592fd624 2020-10-07 op mark_nonblock(sock);
806 9468027b 2020-10-15 op if (bind(sock, addr, len) == -1)
807 f28f9311 2020-10-14 op err(1, "bind");
809 3e4749f7 2020-10-02 op if (listen(sock, 16) == -1)
810 f28f9311 2020-10-14 op err(1, "listen");
816 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
819 592fd624 2020-10-07 op struct sockaddr_in addr;
820 3e4749f7 2020-10-02 op socklen_t len;
822 592fd624 2020-10-07 op len = sizeof(addr);
823 592fd624 2020-10-07 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
824 592fd624 2020-10-07 op if (errno == EWOULDBLOCK)
826 592fd624 2020-10-07 op err(1, "accept");
829 592fd624 2020-10-07 op mark_nonblock(fd);
831 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
832 592fd624 2020-10-07 op if (fds[i].fd == -1) {
833 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
834 592fd624 2020-10-07 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
835 592fd624 2020-10-07 op break; /* goodbye fd! */
837 592fd624 2020-10-07 op fds[i].fd = fd;
838 592fd624 2020-10-07 op fds[i].events = POLLIN;
840 592fd624 2020-10-07 op clients[i].state = S_OPEN;
841 592fd624 2020-10-07 op clients[i].fd = -1;
842 72342dc9 2020-11-06 op clients[i].child = -1;
843 f28f9311 2020-10-14 op clients[i].buf = MAP_FAILED;
844 2c3a40fa 2020-11-06 op clients[i].af = AF_INET;
845 2c3a40fa 2020-11-06 op clients[i].addr = addr.sin_addr;
847 120381c9 2020-11-06 op connected_clients++;
856 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
860 592fd624 2020-10-07 op c->state = S_CLOSING;
862 592fd624 2020-10-07 op ret = tls_close(c->ctx);
863 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
864 592fd624 2020-10-07 op pfd->events = POLLIN;
867 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
868 592fd624 2020-10-07 op pfd->events = POLLOUT;
872 120381c9 2020-11-06 op connected_clients--;
874 592fd624 2020-10-07 op tls_free(c->ctx);
875 592fd624 2020-10-07 op c->ctx = NULL;
877 f28f9311 2020-10-14 op if (c->buf != MAP_FAILED)
878 f28f9311 2020-10-14 op munmap(c->buf, c->len);
880 592fd624 2020-10-07 op if (c->fd != -1)
881 592fd624 2020-10-07 op close(c->fd);
883 592fd624 2020-10-07 op close(pfd->fd);
884 592fd624 2020-10-07 op pfd->fd = -1;
888 592fd624 2020-10-07 op loop(struct tls *ctx, int sock)
891 592fd624 2020-10-07 op struct client clients[MAX_USERS];
892 592fd624 2020-10-07 op struct pollfd fds[MAX_USERS];
894 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
895 592fd624 2020-10-07 op fds[i].fd = -1;
896 592fd624 2020-10-07 op fds[i].events = POLLIN;
897 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
900 592fd624 2020-10-07 op fds[0].fd = sock;
903 120381c9 2020-11-06 op if ((todo = poll(fds, MAX_USERS, INFTIM)) == -1) {
904 120381c9 2020-11-06 op if (errno == EINTR) {
905 120381c9 2020-11-06 op warnx("connected clients: %d", connected_clients);
908 592fd624 2020-10-07 op err(1, "poll");
911 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; i++) {
912 592fd624 2020-10-07 op assert(i < MAX_USERS);
914 592fd624 2020-10-07 op if (fds[i].revents == 0)
917 592fd624 2020-10-07 op if (fds[i].revents & (POLLERR|POLLNVAL))
918 592fd624 2020-10-07 op err(1, "bad fd %d", fds[i].fd);
920 592fd624 2020-10-07 op if (fds[i].revents & POLLHUP) {
921 aff8d190 2020-11-06 op /* fds[i] may be the fd of the stdin
922 aff8d190 2020-11-06 op * of a cgi script that has exited. */
923 aff8d190 2020-11-06 op if (!clients[i].waiting_on_child) {
924 aff8d190 2020-11-06 op goodbye(&fds[i], &clients[i]);
931 592fd624 2020-10-07 op if (i == 0) { /* new client */
932 592fd624 2020-10-07 op do_accept(sock, ctx, fds, clients);
936 592fd624 2020-10-07 op handle(&fds[i], &clients[i]);
942 3e4749f7 2020-10-02 op usage(const char *me)
944 3e4749f7 2020-10-02 op fprintf(stderr,
945 72f653b6 2020-11-06 op "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem] "
946 72f653b6 2020-11-06 op "[-l logfile] [-x cgi-bin]\n",
951 3e4749f7 2020-10-02 op main(int argc, char **argv)
953 72342dc9 2020-11-06 op const char *cert = "cert.pem", *key = "key.pem";
954 3e4749f7 2020-10-02 op struct tls *ctx = NULL;
955 3e4749f7 2020-10-02 op struct tls_config *conf;
956 3e4749f7 2020-10-02 op int sock, ch;
958 0cf902af 2020-11-03 op signal(SIGPIPE, SIG_IGN);
959 72342dc9 2020-11-06 op signal(SIGCHLD, SIG_IGN);
961 120381c9 2020-11-06 op #ifdef SIGINFO
962 120381c9 2020-11-06 op signal(SIGINFO, siginfo_handler);
964 120381c9 2020-11-06 op signal(SIGUSR2, siginfo_handler);
966 120381c9 2020-11-06 op connected_clients = 0;
968 72342dc9 2020-11-06 op dir = "docs/";
969 2c3a40fa 2020-11-06 op logfd = 2; /* stderr */
972 72f653b6 2020-11-06 op while ((ch = getopt(argc, argv, "c:d:hk:l:x:")) != -1) {
973 3e4749f7 2020-10-02 op switch (ch) {
975 3e4749f7 2020-10-02 op cert = optarg;
979 3e4749f7 2020-10-02 op dir = optarg;
983 3e4749f7 2020-10-02 op usage(*argv);
987 3e4749f7 2020-10-02 op key = optarg;
991 2c3a40fa 2020-11-06 op /* open log file or create it with 644 */
992 e8cac16e 2020-11-06 op if ((logfd = open(optarg, O_WRONLY | O_CREAT | O_CLOEXEC,
993 2c3a40fa 2020-11-06 op S_IRUSR | S_IWUSR | S_IRGRP | S_IWOTH)) == -1)
994 2c3a40fa 2020-11-06 op err(1, "%s", optarg);
998 72f653b6 2020-11-06 op cgi = optarg;
1002 3e4749f7 2020-10-02 op usage(*argv);
1007 3e4749f7 2020-10-02 op if ((conf = tls_config_new()) == NULL)
1008 3e4749f7 2020-10-02 op err(1, "tls_config_new");
1010 0d8ca45a 2020-10-03 op if (tls_config_set_protocols(conf,
1011 0d8ca45a 2020-10-03 op TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
1012 0d8ca45a 2020-10-03 op err(1, "tls_config_set_protocols");
1014 4d4f0e19 2020-10-03 op if (tls_config_set_cert_file(conf, cert) == -1)
1015 4d4f0e19 2020-10-03 op err(1, "tls_config_set_cert_file: %s", cert);
1017 4d4f0e19 2020-10-03 op if (tls_config_set_key_file(conf, key) == -1)
1018 4d4f0e19 2020-10-03 op err(1, "tls_config_set_key_file: %s", key);
1020 3e4749f7 2020-10-02 op if ((ctx = tls_server()) == NULL)
1021 3e4749f7 2020-10-02 op err(1, "tls_server");
1023 3e4749f7 2020-10-02 op if (tls_configure(ctx, conf) == -1)
1024 3e4749f7 2020-10-02 op errx(1, "tls_configure: %s", tls_error(ctx));
1026 9468027b 2020-10-15 op sock = make_socket(1965, AF_INET);
1028 3e4749f7 2020-10-02 op if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
1029 3e4749f7 2020-10-02 op err(1, "open: %s", dir);
1031 72f653b6 2020-11-06 op if (cgi != NULL) {
1032 72f653b6 2020-11-06 op if (unveil(dir, "rx") == -1)
1033 72f653b6 2020-11-06 op err(1, "unveil");
1034 72f653b6 2020-11-06 op if (pledge("stdio rpath inet proc exec", NULL) == -1)
1035 72f653b6 2020-11-06 op err(1, "pledge");
1037 72f653b6 2020-11-06 op if (unveil(dir, "r") == -1)
1038 72f653b6 2020-11-06 op err(1, "unveil");
1039 72f653b6 2020-11-06 op if (pledge("stdio rpath inet", NULL) == -1)
1040 72f653b6 2020-11-06 op err(1, "pledge");
1043 3e4749f7 2020-10-02 op loop(ctx, sock);
1045 3e4749f7 2020-10-02 op close(sock);
1046 3e4749f7 2020-10-02 op tls_free(ctx);
1047 3e4749f7 2020-10-02 op tls_config_free(conf);
