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;
120 120381c9 2020-11-06 op int connected_clients;
122 120381c9 2020-11-06 op void siginfo_handler(int);
123 72f653b6 2020-11-06 op int starts_with(const char*, const char*);
125 592fd624 2020-10-07 op char *url_after_proto(char*);
126 592fd624 2020-10-07 op char *url_start_of_request(char*);
127 2c3a40fa 2020-11-06 op int url_trim(struct client*, char*);
128 aa0fe0cf 2020-11-06 op char *adjust_path(char*);
129 f28f9311 2020-10-14 op ssize_t filesize(int);
131 592fd624 2020-10-07 op int start_reply(struct pollfd*, struct client*, int, const char*);
132 cc68fe70 2020-10-07 op const char *path_ext(const char*);
133 cc68fe70 2020-10-07 op const char *mime(const char*);
134 a5d310bc 2020-11-10 op int check_path(const char*, int*);
135 a5d310bc 2020-11-10 op int check_for_cgi(char *, char*, struct pollfd*, struct client*);
136 75d233f0 2020-11-06 op int open_file(char*, char*, struct pollfd*, struct client*);
137 a5d310bc 2020-11-10 op int start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
138 aff8d190 2020-11-06 op void cgi_setpoll_on_child(struct pollfd*, struct client*);
139 aff8d190 2020-11-06 op void cgi_setpoll_on_client(struct pollfd*, struct client*);
140 72342dc9 2020-11-06 op void handle_cgi(struct pollfd*, struct client*);
141 75d233f0 2020-11-06 op void send_file(char*, char*, struct pollfd*, struct client*);
142 592fd624 2020-10-07 op void send_dir(char*, struct pollfd*, struct client*);
143 592fd624 2020-10-07 op void handle(struct pollfd*, struct client*);
145 592fd624 2020-10-07 op void mark_nonblock(int);
146 592fd624 2020-10-07 op int make_soket(int);
147 592fd624 2020-10-07 op void do_accept(int, struct tls*, struct pollfd*, struct client*);
148 592fd624 2020-10-07 op void goodbye(struct pollfd*, struct client*);
149 592fd624 2020-10-07 op void loop(struct tls*, int);
151 592fd624 2020-10-07 op void usage(const char*);
154 120381c9 2020-11-06 op siginfo_handler(int sig)
160 72f653b6 2020-11-06 op starts_with(const char *str, const char *prefix)
164 72f653b6 2020-11-06 op for (i = 0; prefix[i] != '\0'; ++i)
165 72f653b6 2020-11-06 op if (str[i] != prefix[i])
171 3e4749f7 2020-10-02 op url_after_proto(char *url)
174 3e4749f7 2020-10-02 op const char *proto = "gemini";
175 3e4749f7 2020-10-02 op const char *marker = "://";
177 3c19febb 2020-11-06 op /* a relative URL */
178 3e4749f7 2020-10-02 op if ((s = strstr(url, marker)) == NULL)
181 3c19febb 2020-11-06 op if (s - strlen(proto) != url)
184 72f653b6 2020-11-06 op if (!starts_with(url, proto))
187 3e4749f7 2020-10-02 op /* a valid gemini:// URL */
188 3e4749f7 2020-10-02 op return s + strlen(marker);
192 3e4749f7 2020-10-02 op url_start_of_request(char *url)
196 3e4749f7 2020-10-02 op if ((s = url_after_proto(url)) == NULL)
199 3e4749f7 2020-10-02 op if ((t = strstr(s, "/")) == NULL)
200 3e4749f7 2020-10-02 op return s + strlen(s);
205 2c3a40fa 2020-11-06 op url_trim(struct client *c, char *url)
207 3e4749f7 2020-10-02 op const char *e = "\r\n";
210 3e4749f7 2020-10-02 op if ((s = strstr(url, e)) == NULL)
215 3e4749f7 2020-10-02 op if (s[2] != '\0') {
216 2c3a40fa 2020-11-06 op LOG(c, "%s", "request longer than 1024 bytes\n");
224 3e4749f7 2020-10-02 op adjust_path(char *path)
226 aa0fe0cf 2020-11-06 op char *s, *query;
229 aa0fe0cf 2020-11-06 op if ((query = strchr(path, '?')) != NULL) {
230 aa0fe0cf 2020-11-06 op *query = '\0';
234 f28f9311 2020-10-14 op /* /.. -> / */
235 3e4749f7 2020-10-02 op len = strlen(path);
236 3e4749f7 2020-10-02 op if (len >= 3) {
237 3e4749f7 2020-10-02 op if (!strcmp(&path[len-3], "/..")) {
238 3e4749f7 2020-10-02 op path[len-2] = '\0';
242 3e4749f7 2020-10-02 op /* if the path is only `..` trim out and exit */
243 3e4749f7 2020-10-02 op if (!strcmp(path, "..")) {
244 3e4749f7 2020-10-02 op path[0] = '\0';
245 aa0fe0cf 2020-11-06 op return query;
248 3e4749f7 2020-10-02 op /* remove every ../ in the path */
250 3e4749f7 2020-10-02 op if ((s = strstr(path, "../")) == NULL)
251 aa0fe0cf 2020-11-06 op return query;
252 67328d23 2020-10-03 op memmove(s, s+3, strlen(s)+1); /* copy also the \0 */
257 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
259 3e4749f7 2020-10-02 op char buf[1030] = {0}; /* status + ' ' + max reply len + \r\n\0 */
263 592fd624 2020-10-07 op client->code = code;
264 592fd624 2020-10-07 op client->meta = reason;
265 592fd624 2020-10-07 op client->state = S_INITIALIZING;
267 3e4749f7 2020-10-02 op len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
268 3e4749f7 2020-10-02 op assert(len < (int)sizeof(buf));
269 592fd624 2020-10-07 op ret = tls_write(client->ctx, buf, len);
270 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
271 592fd624 2020-10-07 op pfd->events = POLLIN;
275 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
276 592fd624 2020-10-07 op pfd->events = POLLOUT;
284 f28f9311 2020-10-14 op filesize(int fd)
288 f28f9311 2020-10-14 op if ((len = lseek(fd, 0, SEEK_END)) == -1)
290 f28f9311 2020-10-14 op if (lseek(fd, 0, SEEK_SET) == -1)
296 cc68fe70 2020-10-07 op path_ext(const char *path)
298 cc68fe70 2020-10-07 op const char *end;
300 cc68fe70 2020-10-07 op end = path + strlen(path)-1; /* the last byte before the NUL */
301 cc68fe70 2020-10-07 op for (; end != path; --end) {
302 cc68fe70 2020-10-07 op if (*end == '.')
303 cc68fe70 2020-10-07 op return end+1;
304 cc68fe70 2020-10-07 op if (*end == '/')
312 cc68fe70 2020-10-07 op mime(const char *path)
314 cc68fe70 2020-10-07 op const char *ext, *def = "application/octet-stream";
315 cc68fe70 2020-10-07 op struct etm *t;
317 cc68fe70 2020-10-07 op if ((ext = path_ext(path)) == NULL)
320 cc68fe70 2020-10-07 op for (t = filetypes; t->mime != NULL; ++t)
321 cc68fe70 2020-10-07 op if (!strcmp(ext, t->ext))
322 cc68fe70 2020-10-07 op return t->mime;
328 a5d310bc 2020-11-10 op check_path(const char *path, int *fd)
330 72342dc9 2020-11-06 op struct stat sb;
332 f28f9311 2020-10-14 op assert(path != NULL);
333 a5d310bc 2020-11-10 op if ((*fd = openat(dirfd, path,
334 a5d310bc 2020-11-10 op O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
335 a5d310bc 2020-11-10 op return FILE_MISSING;
338 a5d310bc 2020-11-10 op if (fstat(*fd, &sb) == -1) {
339 a5d310bc 2020-11-10 op dprintf(logfd, "failed stat for %s\n", path);
340 a5d310bc 2020-11-10 op return FILE_MISSING;
343 a5d310bc 2020-11-10 op if (S_ISDIR(sb.st_mode))
344 a5d310bc 2020-11-10 op return FILE_DIRECTORY;
346 a5d310bc 2020-11-10 op if (sb.st_mode & S_IXUSR)
347 a5d310bc 2020-11-10 op return FILE_EXECUTABLE;
349 a5d310bc 2020-11-10 op return FILE_EXISTS;
353 a5d310bc 2020-11-10 op * the inverse of this algorithm, i.e. starting from the start of the
354 a5d310bc 2020-11-10 op * path + strlen(cgi), and checking if each component, should be
355 a5d310bc 2020-11-10 op * faster. But it's tedious to write. This does the opposite: starts
356 a5d310bc 2020-11-10 op * from the end and strip one component at a time, until either an
357 a5d310bc 2020-11-10 op * executable is found or we emptied the path.
360 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
363 a5d310bc 2020-11-10 op end = strchr(path, '\0');
365 a5d310bc 2020-11-10 op /* NB: assume CGI is enabled and path matches cgi */
367 a5d310bc 2020-11-10 op while (end > path) {
368 a5d310bc 2020-11-10 op /* go up one level. UNIX paths are simple and POSIX
369 a5d310bc 2020-11-10 op * dirname, with its ambiguities on if the given path
370 a5d310bc 2020-11-10 op * is changed or not, gives me headaches. */
371 a5d310bc 2020-11-10 op while (*end != '/')
375 a5d310bc 2020-11-10 op switch (check_path(path, &c->fd)) {
376 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
377 a5d310bc 2020-11-10 op return start_cgi(path, end+1, query, fds,c);
378 a5d310bc 2020-11-10 op case FILE_MISSING:
389 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
391 a5d310bc 2020-11-10 op goodbye(fds, c);
397 a5d310bc 2020-11-10 op open_file(char *path, char *query, struct pollfd *fds, struct client *c)
399 a5d310bc 2020-11-10 op char fpath[PATHBUF];
401 f28f9311 2020-10-14 op bzero(fpath, sizeof(fpath));
403 f28f9311 2020-10-14 op if (*path != '.')
404 f28f9311 2020-10-14 op fpath[0] = '.';
405 f28f9311 2020-10-14 op strlcat(fpath, path, PATHBUF);
407 a5d310bc 2020-11-10 op switch (check_path(fpath, &c->fd)) {
408 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
409 a5d310bc 2020-11-10 op /* +2 to skip the ./ */
410 a5d310bc 2020-11-10 op if (cgi != NULL && starts_with(fpath+2, cgi))
411 a5d310bc 2020-11-10 op return start_cgi(fpath, "", query, fds, c);
413 a5d310bc 2020-11-10 op /* fallthrough */
415 a5d310bc 2020-11-10 op case FILE_EXISTS:
416 a5d310bc 2020-11-10 op if ((c->len = filesize(c->fd)) == -1) {
417 a5d310bc 2020-11-10 op LOG(c, "failed to get file size for %s", fpath);
418 a5d310bc 2020-11-10 op goodbye(fds, c);
422 a5d310bc 2020-11-10 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
423 a5d310bc 2020-11-10 op c->fd, 0)) == MAP_FAILED) {
424 a5d310bc 2020-11-10 op warn("mmap: %s", fpath);
425 a5d310bc 2020-11-10 op goodbye(fds, c);
428 a5d310bc 2020-11-10 op c->i = c->buf;
429 a5d310bc 2020-11-10 op return start_reply(fds, c, SUCCESS, mime(fpath));
431 a5d310bc 2020-11-10 op case FILE_DIRECTORY:
432 2c3a40fa 2020-11-06 op LOG(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
433 f28f9311 2020-10-14 op close(c->fd);
435 f28f9311 2020-10-14 op send_dir(fpath, fds, c);
438 a5d310bc 2020-11-10 op case FILE_MISSING:
439 a5d310bc 2020-11-10 op if (cgi != NULL && starts_with(fpath+2, cgi))
440 a5d310bc 2020-11-10 op return check_for_cgi(fpath, query, fds, c);
442 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
444 f28f9311 2020-10-14 op goodbye(fds, c);
448 a5d310bc 2020-11-10 op /* unreachable */
454 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
455 75d233f0 2020-11-06 op struct pollfd *fds, struct client *c)
458 a5d310bc 2020-11-10 op int p[2]; /* read end, write end */
460 72342dc9 2020-11-06 op if (pipe(p) == -1)
463 72342dc9 2020-11-06 op switch (pid = fork()) {
467 a5d310bc 2020-11-10 op case 0: { /* child */
468 721e2325 2020-11-18 op char *ex, *requri, *portno;
469 72342dc9 2020-11-06 op char addr[INET_ADDRSTRLEN];
470 72342dc9 2020-11-06 op char *argv[] = { NULL, NULL, NULL };
475 72342dc9 2020-11-06 op if (dup2(p[1], 1) == -1)
476 72342dc9 2020-11-06 op goto childerr;
478 72342dc9 2020-11-06 op if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
479 a5d310bc 2020-11-10 op goto childerr;
481 721e2325 2020-11-18 op if (asprintf(&portno, "%d", port) == -1)
482 721e2325 2020-11-18 op goto childerr;
484 a5d310bc 2020-11-10 op if (asprintf(&ex, "%s%s", dir, spath+1) == -1)
485 72342dc9 2020-11-06 op goto childerr;
487 a5d310bc 2020-11-10 op if (asprintf(&requri, "%s%s%s", spath,
488 a5d310bc 2020-11-10 op *relpath == '\0' ? "" : "/",
489 a5d310bc 2020-11-10 op relpath) == -1)
490 a5d310bc 2020-11-10 op goto childerr;
492 a5d310bc 2020-11-10 op argv[0] = argv[1] = ex;
494 60ba426e 2020-11-06 op /* fix the env */
495 60ba426e 2020-11-06 op setenv("SERVER_SOFTWARE", "gmid", 1);
496 721e2325 2020-11-18 op setenv("SERVER_PORT", portno, 1);
497 a5d310bc 2020-11-10 op /* setenv("SERVER_NAME", "", 1); */
498 a5d310bc 2020-11-10 op setenv("SCRIPT_NAME", spath, 1);
499 a5d310bc 2020-11-10 op setenv("SCRIPT_EXECUTABLE", ex, 1);
500 a5d310bc 2020-11-10 op setenv("REQUEST_URI", requri, 1);
501 a5d310bc 2020-11-10 op setenv("REQUEST_RELATIVE", relpath, 1);
502 f65ed018 2020-11-06 op if (query != NULL)
503 f65ed018 2020-11-06 op setenv("QUERY_STRING", query, 1);
504 a5d310bc 2020-11-10 op setenv("REMOTE_HOST", addr, 1);
505 a5d310bc 2020-11-10 op setenv("DOCUMENT_ROOT", dir, 1);
507 a5d310bc 2020-11-10 op execvp(ex, argv);
508 72342dc9 2020-11-06 op goto childerr;
511 72342dc9 2020-11-06 op default: /* parent */
513 72342dc9 2020-11-06 op close(c->fd);
514 72342dc9 2020-11-06 op c->fd = p[0];
515 72342dc9 2020-11-06 op c->child = pid;
516 aff8d190 2020-11-06 op mark_nonblock(c->fd);
517 aff8d190 2020-11-06 op c->state = S_SENDING;
518 72342dc9 2020-11-06 op handle_cgi(fds, c);
523 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
525 72342dc9 2020-11-06 op goodbye(fds, c);
529 72342dc9 2020-11-06 op dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
535 aff8d190 2020-11-06 op cgi_setpoll_on_child(struct pollfd *fds, struct client *c)
539 aff8d190 2020-11-06 op if (c->waiting_on_child)
541 aff8d190 2020-11-06 op c->waiting_on_child = 1;
543 aff8d190 2020-11-06 op fds->events = POLLIN;
545 aff8d190 2020-11-06 op fd = fds->fd;
546 aff8d190 2020-11-06 op fds->fd = c->fd;
551 aff8d190 2020-11-06 op cgi_setpoll_on_client(struct pollfd *fds, struct client *c)
555 aff8d190 2020-11-06 op if (!c->waiting_on_child)
557 aff8d190 2020-11-06 op c->waiting_on_child = 0;
559 aff8d190 2020-11-06 op fd = fds->fd;
560 aff8d190 2020-11-06 op fds->fd = c->fd;
565 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
569 aff8d190 2020-11-06 op /* ensure c->fd is the child and fds->fd the client */
570 aff8d190 2020-11-06 op cgi_setpoll_on_client(fds, c);
573 aff8d190 2020-11-06 op if (c->len == 0) {
574 aff8d190 2020-11-06 op if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
576 aff8d190 2020-11-06 op if (r == -1) {
577 aff8d190 2020-11-06 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
578 aff8d190 2020-11-06 op cgi_setpoll_on_child(fds, c);
587 aff8d190 2020-11-06 op while (c->len > 0) {
588 aff8d190 2020-11-06 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
592 72342dc9 2020-11-06 op case TLS_WANT_POLLOUT:
593 aff8d190 2020-11-06 op fds->events = POLLOUT;
596 72342dc9 2020-11-06 op case TLS_WANT_POLLIN:
597 aff8d190 2020-11-06 op fds->events = POLLIN;
609 72342dc9 2020-11-06 op goodbye(fds, c);
613 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
615 f28f9311 2020-10-14 op ssize_t ret, len;
617 f28f9311 2020-10-14 op if (c->fd == -1) {
618 75d233f0 2020-11-06 op if (!open_file(path, query, fds, c))
620 f28f9311 2020-10-14 op c->state = S_SENDING;
623 f28f9311 2020-10-14 op len = (c->buf + c->len) - c->i;
625 f28f9311 2020-10-14 op while (len > 0) {
626 f28f9311 2020-10-14 op switch (ret = tls_write(c->ctx, c->i, len)) {
628 2c3a40fa 2020-11-06 op LOG(c, "tls_write: %s", tls_error(c->ctx));
629 f28f9311 2020-10-14 op goodbye(fds, c);
632 f28f9311 2020-10-14 op case TLS_WANT_POLLIN:
633 f28f9311 2020-10-14 op fds->events = POLLIN;
636 f28f9311 2020-10-14 op case TLS_WANT_POLLOUT:
637 f28f9311 2020-10-14 op fds->events = POLLOUT;
647 f28f9311 2020-10-14 op goodbye(fds, c);
651 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
653 3e4749f7 2020-10-02 op char fpath[PATHBUF];
656 3e4749f7 2020-10-02 op bzero(fpath, PATHBUF);
658 9c56b0a7 2020-10-14 op if (path[0] != '.')
659 3e4749f7 2020-10-02 op fpath[0] = '.';
661 3e4749f7 2020-10-02 op /* this cannot fail since sizeof(fpath) > maxlen of path */
662 3e4749f7 2020-10-02 op strlcat(fpath, path, PATHBUF);
663 3e4749f7 2020-10-02 op len = strlen(fpath);
665 3e4749f7 2020-10-02 op /* add a trailing / in case. */
666 3e4749f7 2020-10-02 op if (fpath[len-1] != '/') {
667 3e4749f7 2020-10-02 op fpath[len] = '/';
670 3e4749f7 2020-10-02 op strlcat(fpath, "index.gmi", sizeof(fpath));
672 75d233f0 2020-11-06 op send_file(fpath, NULL, fds, client);
676 592fd624 2020-10-07 op handle(struct pollfd *fds, struct client *client)
678 592fd624 2020-10-07 op char buf[GEMINI_URL_LEN];
682 592fd624 2020-10-07 op switch (client->state) {
684 592fd624 2020-10-07 op bzero(buf, GEMINI_URL_LEN);
685 592fd624 2020-10-07 op switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
687 2c3a40fa 2020-11-06 op LOG(client, "tls_read: %s", tls_error(client->ctx));
688 592fd624 2020-10-07 op goodbye(fds, client);
691 592fd624 2020-10-07 op case TLS_WANT_POLLIN:
692 592fd624 2020-10-07 op fds->events = POLLIN;
695 592fd624 2020-10-07 op case TLS_WANT_POLLOUT:
696 592fd624 2020-10-07 op fds->events = POLLOUT;
700 2c3a40fa 2020-11-06 op if (!url_trim(client, buf)) {
701 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
703 592fd624 2020-10-07 op goodbye(fds, client);
707 592fd624 2020-10-07 op if ((path = url_start_of_request(buf)) == NULL) {
708 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
710 592fd624 2020-10-07 op goodbye(fds, client);
714 aa0fe0cf 2020-11-06 op query = adjust_path(path);
715 aa0fe0cf 2020-11-06 op LOG(client, "get %s%s%s", path,
716 aa0fe0cf 2020-11-06 op query ? "?" : "",
717 aa0fe0cf 2020-11-06 op query ? query : "");
719 a5d310bc 2020-11-10 op send_file(path, query, fds, client);
722 592fd624 2020-10-07 op case S_INITIALIZING:
723 592fd624 2020-10-07 op if (!start_reply(fds, client, client->code, client->meta))
726 592fd624 2020-10-07 op if (client->code != SUCCESS) {
727 592fd624 2020-10-07 op /* we don't need a body */
728 592fd624 2020-10-07 op goodbye(fds, client);
732 592fd624 2020-10-07 op client->state = S_SENDING;
734 592fd624 2020-10-07 op /* fallthrough */
736 592fd624 2020-10-07 op case S_SENDING:
737 aff8d190 2020-11-06 op if (client->child != -1)
738 aff8d190 2020-11-06 op handle_cgi(fds, client);
740 aff8d190 2020-11-06 op send_file(NULL, NULL, fds, client);
743 592fd624 2020-10-07 op case S_CLOSING:
744 592fd624 2020-10-07 op goodbye(fds, client);
748 592fd624 2020-10-07 op /* unreachable */
754 592fd624 2020-10-07 op mark_nonblock(int fd)
758 592fd624 2020-10-07 op if ((flags = fcntl(fd, F_GETFL)) == -1)
759 592fd624 2020-10-07 op err(1, "fcntl(F_GETFL)");
760 592fd624 2020-10-07 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
761 592fd624 2020-10-07 op err(1, "fcntl(F_SETFL)");
765 9468027b 2020-10-15 op make_socket(int port, int family)
768 9468027b 2020-10-15 op struct sockaddr_in addr4;
769 9468027b 2020-10-15 op struct sockaddr_in6 addr6;
770 9468027b 2020-10-15 op struct sockaddr *addr;
771 9468027b 2020-10-15 op socklen_t len;
773 9468027b 2020-10-15 op switch (family) {
774 9468027b 2020-10-15 op case AF_INET:
775 9468027b 2020-10-15 op bzero(&addr4, sizeof(addr4));
776 9468027b 2020-10-15 op addr4.sin_family = family;
777 9468027b 2020-10-15 op addr4.sin_port = htons(port);
778 9468027b 2020-10-15 op addr4.sin_addr.s_addr = INADDR_ANY;
779 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr4;
780 9468027b 2020-10-15 op len = sizeof(addr4);
783 9468027b 2020-10-15 op case AF_INET6:
784 9468027b 2020-10-15 op bzero(&addr6, sizeof(addr6));
785 9468027b 2020-10-15 op addr6.sin6_family = AF_INET6;
786 9468027b 2020-10-15 op addr6.sin6_port = htons(port);
787 9468027b 2020-10-15 op addr6.sin6_addr = in6addr_any;
788 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr6;
789 9468027b 2020-10-15 op len = sizeof(addr6);
793 9468027b 2020-10-15 op /* unreachable */
797 9468027b 2020-10-15 op if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
798 f28f9311 2020-10-14 op err(1, "socket");
801 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
802 3e4749f7 2020-10-02 op err(1, "setsockopt(SO_REUSEADDR)");
805 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
806 3e4749f7 2020-10-02 op err(1, "setsockopt(SO_REUSEPORT)");
808 592fd624 2020-10-07 op mark_nonblock(sock);
810 9468027b 2020-10-15 op if (bind(sock, addr, len) == -1)
811 f28f9311 2020-10-14 op err(1, "bind");
813 3e4749f7 2020-10-02 op if (listen(sock, 16) == -1)
814 f28f9311 2020-10-14 op err(1, "listen");
820 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
823 592fd624 2020-10-07 op struct sockaddr_in addr;
824 3e4749f7 2020-10-02 op socklen_t len;
826 592fd624 2020-10-07 op len = sizeof(addr);
827 592fd624 2020-10-07 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
828 592fd624 2020-10-07 op if (errno == EWOULDBLOCK)
830 592fd624 2020-10-07 op err(1, "accept");
833 592fd624 2020-10-07 op mark_nonblock(fd);
835 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
836 592fd624 2020-10-07 op if (fds[i].fd == -1) {
837 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
838 592fd624 2020-10-07 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
839 592fd624 2020-10-07 op break; /* goodbye fd! */
841 592fd624 2020-10-07 op fds[i].fd = fd;
842 592fd624 2020-10-07 op fds[i].events = POLLIN;
844 592fd624 2020-10-07 op clients[i].state = S_OPEN;
845 592fd624 2020-10-07 op clients[i].fd = -1;
846 72342dc9 2020-11-06 op clients[i].child = -1;
847 f28f9311 2020-10-14 op clients[i].buf = MAP_FAILED;
848 2c3a40fa 2020-11-06 op clients[i].af = AF_INET;
849 2c3a40fa 2020-11-06 op clients[i].addr = addr.sin_addr;
851 120381c9 2020-11-06 op connected_clients++;
860 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
864 592fd624 2020-10-07 op c->state = S_CLOSING;
866 592fd624 2020-10-07 op ret = tls_close(c->ctx);
867 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
868 592fd624 2020-10-07 op pfd->events = POLLIN;
871 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
872 592fd624 2020-10-07 op pfd->events = POLLOUT;
876 120381c9 2020-11-06 op connected_clients--;
878 592fd624 2020-10-07 op tls_free(c->ctx);
879 592fd624 2020-10-07 op c->ctx = NULL;
881 f28f9311 2020-10-14 op if (c->buf != MAP_FAILED)
882 f28f9311 2020-10-14 op munmap(c->buf, c->len);
884 592fd624 2020-10-07 op if (c->fd != -1)
885 592fd624 2020-10-07 op close(c->fd);
887 592fd624 2020-10-07 op close(pfd->fd);
888 592fd624 2020-10-07 op pfd->fd = -1;
892 592fd624 2020-10-07 op loop(struct tls *ctx, int sock)
895 592fd624 2020-10-07 op struct client clients[MAX_USERS];
896 592fd624 2020-10-07 op struct pollfd fds[MAX_USERS];
898 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
899 592fd624 2020-10-07 op fds[i].fd = -1;
900 592fd624 2020-10-07 op fds[i].events = POLLIN;
901 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
904 592fd624 2020-10-07 op fds[0].fd = sock;
907 120381c9 2020-11-06 op if ((todo = poll(fds, MAX_USERS, INFTIM)) == -1) {
908 120381c9 2020-11-06 op if (errno == EINTR) {
909 120381c9 2020-11-06 op warnx("connected clients: %d", connected_clients);
912 592fd624 2020-10-07 op err(1, "poll");
915 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; i++) {
916 592fd624 2020-10-07 op assert(i < MAX_USERS);
918 592fd624 2020-10-07 op if (fds[i].revents == 0)
921 592fd624 2020-10-07 op if (fds[i].revents & (POLLERR|POLLNVAL))
922 592fd624 2020-10-07 op err(1, "bad fd %d", fds[i].fd);
924 592fd624 2020-10-07 op if (fds[i].revents & POLLHUP) {
925 aff8d190 2020-11-06 op /* fds[i] may be the fd of the stdin
926 aff8d190 2020-11-06 op * of a cgi script that has exited. */
927 aff8d190 2020-11-06 op if (!clients[i].waiting_on_child) {
928 aff8d190 2020-11-06 op goodbye(&fds[i], &clients[i]);
935 592fd624 2020-10-07 op if (i == 0) { /* new client */
936 592fd624 2020-10-07 op do_accept(sock, ctx, fds, clients);
940 592fd624 2020-10-07 op handle(&fds[i], &clients[i]);
946 3e4749f7 2020-10-02 op usage(const char *me)
948 3e4749f7 2020-10-02 op fprintf(stderr,
949 72f653b6 2020-11-06 op "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem] "
950 721e2325 2020-11-18 op "[-l logfile] [-p port] [-x cgi-bin]\n",
955 3e4749f7 2020-10-02 op main(int argc, char **argv)
957 72342dc9 2020-11-06 op const char *cert = "cert.pem", *key = "key.pem";
958 3e4749f7 2020-10-02 op struct tls *ctx = NULL;
959 3e4749f7 2020-10-02 op struct tls_config *conf;
960 3e4749f7 2020-10-02 op int sock, ch;
962 0cf902af 2020-11-03 op signal(SIGPIPE, SIG_IGN);
963 72342dc9 2020-11-06 op signal(SIGCHLD, SIG_IGN);
965 120381c9 2020-11-06 op #ifdef SIGINFO
966 120381c9 2020-11-06 op signal(SIGINFO, siginfo_handler);
968 120381c9 2020-11-06 op signal(SIGUSR2, siginfo_handler);
970 120381c9 2020-11-06 op connected_clients = 0;
972 72342dc9 2020-11-06 op dir = "docs/";
973 2c3a40fa 2020-11-06 op logfd = 2; /* stderr */
977 721e2325 2020-11-18 op while ((ch = getopt(argc, argv, "c:d:hk:l:p:x:")) != -1) {
978 3e4749f7 2020-10-02 op switch (ch) {
980 3e4749f7 2020-10-02 op cert = optarg;
984 3e4749f7 2020-10-02 op dir = optarg;
988 3e4749f7 2020-10-02 op usage(*argv);
992 3e4749f7 2020-10-02 op key = optarg;
996 2c3a40fa 2020-11-06 op /* open log file or create it with 644 */
997 e8cac16e 2020-11-06 op if ((logfd = open(optarg, O_WRONLY | O_CREAT | O_CLOEXEC,
998 2c3a40fa 2020-11-06 op S_IRUSR | S_IWUSR | S_IRGRP | S_IWOTH)) == -1)
999 2c3a40fa 2020-11-06 op err(1, "%s", optarg);
1007 721e2325 2020-11-18 op lval = strtol(optarg, &ep, 10);
1008 721e2325 2020-11-18 op if (optarg[0] == '\0' || *ep != '\0')
1009 721e2325 2020-11-18 op err(1, "not a number: %s", optarg);
1010 721e2325 2020-11-18 op if (lval < 0 || lval > UINT16_MAX)
1011 721e2325 2020-11-18 op err(1, "port number out of range: %s", optarg);
1012 721e2325 2020-11-18 op port = lval;
1017 72f653b6 2020-11-06 op cgi = optarg;
1021 3e4749f7 2020-10-02 op usage(*argv);
1026 3e4749f7 2020-10-02 op if ((conf = tls_config_new()) == NULL)
1027 3e4749f7 2020-10-02 op err(1, "tls_config_new");
1029 0d8ca45a 2020-10-03 op if (tls_config_set_protocols(conf,
1030 0d8ca45a 2020-10-03 op TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
1031 0d8ca45a 2020-10-03 op err(1, "tls_config_set_protocols");
1033 4d4f0e19 2020-10-03 op if (tls_config_set_cert_file(conf, cert) == -1)
1034 4d4f0e19 2020-10-03 op err(1, "tls_config_set_cert_file: %s", cert);
1036 4d4f0e19 2020-10-03 op if (tls_config_set_key_file(conf, key) == -1)
1037 4d4f0e19 2020-10-03 op err(1, "tls_config_set_key_file: %s", key);
1039 3e4749f7 2020-10-02 op if ((ctx = tls_server()) == NULL)
1040 3e4749f7 2020-10-02 op err(1, "tls_server");
1042 3e4749f7 2020-10-02 op if (tls_configure(ctx, conf) == -1)
1043 3e4749f7 2020-10-02 op errx(1, "tls_configure: %s", tls_error(ctx));
1045 721e2325 2020-11-18 op sock = make_socket(port, AF_INET);
1047 3e4749f7 2020-10-02 op if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
1048 3e4749f7 2020-10-02 op err(1, "open: %s", dir);
1050 72f653b6 2020-11-06 op if (cgi != NULL) {
1051 72f653b6 2020-11-06 op if (unveil(dir, "rx") == -1)
1052 72f653b6 2020-11-06 op err(1, "unveil");
1053 72f653b6 2020-11-06 op if (pledge("stdio rpath inet proc exec", NULL) == -1)
1054 72f653b6 2020-11-06 op err(1, "pledge");
1056 72f653b6 2020-11-06 op if (unveil(dir, "r") == -1)
1057 72f653b6 2020-11-06 op err(1, "unveil");
1058 72f653b6 2020-11-06 op if (pledge("stdio rpath inet", NULL) == -1)
1059 72f653b6 2020-11-06 op err(1, "pledge");
1062 3e4749f7 2020-10-02 op loop(ctx, sock);
1064 3e4749f7 2020-10-02 op close(sock);
1065 3e4749f7 2020-10-02 op tls_free(ctx);
1066 3e4749f7 2020-10-02 op tls_config_free(conf);
