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 ae2ad03e 2020-11-18 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)
182 ae2ad03e 2020-11-18 op * if a protocol is not specified, gemini should be implied:
183 ae2ad03e 2020-11-18 op * this handles the case of //example.com
185 ae2ad03e 2020-11-18 op if (s == url)
186 ae2ad03e 2020-11-18 op return s + strlen(marker);
188 3c19febb 2020-11-06 op if (s - strlen(proto) != url)
191 72f653b6 2020-11-06 op if (!starts_with(url, proto))
194 3e4749f7 2020-10-02 op return s + strlen(marker);
198 3e4749f7 2020-10-02 op url_start_of_request(char *url)
202 3e4749f7 2020-10-02 op if ((s = url_after_proto(url)) == NULL)
205 3e4749f7 2020-10-02 op if ((t = strstr(s, "/")) == NULL)
206 3e4749f7 2020-10-02 op return s + strlen(s);
211 2c3a40fa 2020-11-06 op url_trim(struct client *c, char *url)
213 3e4749f7 2020-10-02 op const char *e = "\r\n";
216 3e4749f7 2020-10-02 op if ((s = strstr(url, e)) == NULL)
221 3e4749f7 2020-10-02 op if (s[2] != '\0') {
222 2c3a40fa 2020-11-06 op LOG(c, "%s", "request longer than 1024 bytes\n");
230 3e4749f7 2020-10-02 op adjust_path(char *path)
232 aa0fe0cf 2020-11-06 op char *s, *query;
235 aa0fe0cf 2020-11-06 op if ((query = strchr(path, '?')) != NULL) {
236 aa0fe0cf 2020-11-06 op *query = '\0';
240 f28f9311 2020-10-14 op /* /.. -> / */
241 3e4749f7 2020-10-02 op len = strlen(path);
242 3e4749f7 2020-10-02 op if (len >= 3) {
243 3e4749f7 2020-10-02 op if (!strcmp(&path[len-3], "/..")) {
244 3e4749f7 2020-10-02 op path[len-2] = '\0';
248 3e4749f7 2020-10-02 op /* if the path is only `..` trim out and exit */
249 3e4749f7 2020-10-02 op if (!strcmp(path, "..")) {
250 3e4749f7 2020-10-02 op path[0] = '\0';
251 aa0fe0cf 2020-11-06 op return query;
254 3e4749f7 2020-10-02 op /* remove every ../ in the path */
256 3e4749f7 2020-10-02 op if ((s = strstr(path, "../")) == NULL)
257 aa0fe0cf 2020-11-06 op return query;
258 67328d23 2020-10-03 op memmove(s, s+3, strlen(s)+1); /* copy also the \0 */
263 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
265 3e4749f7 2020-10-02 op char buf[1030] = {0}; /* status + ' ' + max reply len + \r\n\0 */
269 592fd624 2020-10-07 op client->code = code;
270 592fd624 2020-10-07 op client->meta = reason;
271 592fd624 2020-10-07 op client->state = S_INITIALIZING;
273 3e4749f7 2020-10-02 op len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
274 3e4749f7 2020-10-02 op assert(len < (int)sizeof(buf));
275 592fd624 2020-10-07 op ret = tls_write(client->ctx, buf, len);
276 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
277 592fd624 2020-10-07 op pfd->events = POLLIN;
281 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
282 592fd624 2020-10-07 op pfd->events = POLLOUT;
290 f28f9311 2020-10-14 op filesize(int fd)
294 f28f9311 2020-10-14 op if ((len = lseek(fd, 0, SEEK_END)) == -1)
296 f28f9311 2020-10-14 op if (lseek(fd, 0, SEEK_SET) == -1)
302 cc68fe70 2020-10-07 op path_ext(const char *path)
304 cc68fe70 2020-10-07 op const char *end;
306 cc68fe70 2020-10-07 op end = path + strlen(path)-1; /* the last byte before the NUL */
307 cc68fe70 2020-10-07 op for (; end != path; --end) {
308 cc68fe70 2020-10-07 op if (*end == '.')
309 cc68fe70 2020-10-07 op return end+1;
310 cc68fe70 2020-10-07 op if (*end == '/')
318 cc68fe70 2020-10-07 op mime(const char *path)
320 cc68fe70 2020-10-07 op const char *ext, *def = "application/octet-stream";
321 cc68fe70 2020-10-07 op struct etm *t;
323 cc68fe70 2020-10-07 op if ((ext = path_ext(path)) == NULL)
326 cc68fe70 2020-10-07 op for (t = filetypes; t->mime != NULL; ++t)
327 cc68fe70 2020-10-07 op if (!strcmp(ext, t->ext))
328 cc68fe70 2020-10-07 op return t->mime;
334 a5d310bc 2020-11-10 op check_path(const char *path, int *fd)
336 72342dc9 2020-11-06 op struct stat sb;
338 f28f9311 2020-10-14 op assert(path != NULL);
339 a5d310bc 2020-11-10 op if ((*fd = openat(dirfd, path,
340 a5d310bc 2020-11-10 op O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
341 a5d310bc 2020-11-10 op return FILE_MISSING;
344 a5d310bc 2020-11-10 op if (fstat(*fd, &sb) == -1) {
345 a5d310bc 2020-11-10 op dprintf(logfd, "failed stat for %s\n", path);
346 a5d310bc 2020-11-10 op return FILE_MISSING;
349 a5d310bc 2020-11-10 op if (S_ISDIR(sb.st_mode))
350 a5d310bc 2020-11-10 op return FILE_DIRECTORY;
352 a5d310bc 2020-11-10 op if (sb.st_mode & S_IXUSR)
353 a5d310bc 2020-11-10 op return FILE_EXECUTABLE;
355 a5d310bc 2020-11-10 op return FILE_EXISTS;
359 a5d310bc 2020-11-10 op * the inverse of this algorithm, i.e. starting from the start of the
360 a5d310bc 2020-11-10 op * path + strlen(cgi), and checking if each component, should be
361 a5d310bc 2020-11-10 op * faster. But it's tedious to write. This does the opposite: starts
362 a5d310bc 2020-11-10 op * from the end and strip one component at a time, until either an
363 a5d310bc 2020-11-10 op * executable is found or we emptied the path.
366 a5d310bc 2020-11-10 op check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
369 a5d310bc 2020-11-10 op end = strchr(path, '\0');
371 a5d310bc 2020-11-10 op /* NB: assume CGI is enabled and path matches cgi */
373 a5d310bc 2020-11-10 op while (end > path) {
374 a5d310bc 2020-11-10 op /* go up one level. UNIX paths are simple and POSIX
375 a5d310bc 2020-11-10 op * dirname, with its ambiguities on if the given path
376 a5d310bc 2020-11-10 op * is changed or not, gives me headaches. */
377 a5d310bc 2020-11-10 op while (*end != '/')
381 a5d310bc 2020-11-10 op switch (check_path(path, &c->fd)) {
382 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
383 a5d310bc 2020-11-10 op return start_cgi(path, end+1, query, fds,c);
384 a5d310bc 2020-11-10 op case FILE_MISSING:
395 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
397 a5d310bc 2020-11-10 op goodbye(fds, c);
403 a5d310bc 2020-11-10 op open_file(char *path, char *query, struct pollfd *fds, struct client *c)
405 a5d310bc 2020-11-10 op char fpath[PATHBUF];
407 f28f9311 2020-10-14 op bzero(fpath, sizeof(fpath));
409 f28f9311 2020-10-14 op if (*path != '.')
410 f28f9311 2020-10-14 op fpath[0] = '.';
411 f28f9311 2020-10-14 op strlcat(fpath, path, PATHBUF);
413 a5d310bc 2020-11-10 op switch (check_path(fpath, &c->fd)) {
414 a5d310bc 2020-11-10 op case FILE_EXECUTABLE:
415 a5d310bc 2020-11-10 op /* +2 to skip the ./ */
416 a5d310bc 2020-11-10 op if (cgi != NULL && starts_with(fpath+2, cgi))
417 a5d310bc 2020-11-10 op return start_cgi(fpath, "", query, fds, c);
419 a5d310bc 2020-11-10 op /* fallthrough */
421 a5d310bc 2020-11-10 op case FILE_EXISTS:
422 a5d310bc 2020-11-10 op if ((c->len = filesize(c->fd)) == -1) {
423 a5d310bc 2020-11-10 op LOG(c, "failed to get file size for %s", fpath);
424 a5d310bc 2020-11-10 op goodbye(fds, c);
428 a5d310bc 2020-11-10 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
429 a5d310bc 2020-11-10 op c->fd, 0)) == MAP_FAILED) {
430 a5d310bc 2020-11-10 op warn("mmap: %s", fpath);
431 a5d310bc 2020-11-10 op goodbye(fds, c);
434 a5d310bc 2020-11-10 op c->i = c->buf;
435 a5d310bc 2020-11-10 op return start_reply(fds, c, SUCCESS, mime(fpath));
437 a5d310bc 2020-11-10 op case FILE_DIRECTORY:
438 2c3a40fa 2020-11-06 op LOG(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
439 f28f9311 2020-10-14 op close(c->fd);
441 f28f9311 2020-10-14 op send_dir(fpath, fds, c);
444 a5d310bc 2020-11-10 op case FILE_MISSING:
445 a5d310bc 2020-11-10 op if (cgi != NULL && starts_with(fpath+2, cgi))
446 a5d310bc 2020-11-10 op return check_for_cgi(fpath, query, fds, c);
448 a5d310bc 2020-11-10 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
450 f28f9311 2020-10-14 op goodbye(fds, c);
454 a5d310bc 2020-11-10 op /* unreachable */
460 a5d310bc 2020-11-10 op start_cgi(const char *spath, const char *relpath, const char *query,
461 75d233f0 2020-11-06 op struct pollfd *fds, struct client *c)
464 a5d310bc 2020-11-10 op int p[2]; /* read end, write end */
466 72342dc9 2020-11-06 op if (pipe(p) == -1)
469 72342dc9 2020-11-06 op switch (pid = fork()) {
473 a5d310bc 2020-11-10 op case 0: { /* child */
474 721e2325 2020-11-18 op char *ex, *requri, *portno;
475 72342dc9 2020-11-06 op char addr[INET_ADDRSTRLEN];
476 72342dc9 2020-11-06 op char *argv[] = { NULL, NULL, NULL };
481 72342dc9 2020-11-06 op if (dup2(p[1], 1) == -1)
482 72342dc9 2020-11-06 op goto childerr;
484 72342dc9 2020-11-06 op if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
485 a5d310bc 2020-11-10 op goto childerr;
487 721e2325 2020-11-18 op if (asprintf(&portno, "%d", port) == -1)
488 721e2325 2020-11-18 op goto childerr;
490 a5d310bc 2020-11-10 op if (asprintf(&ex, "%s%s", dir, spath+1) == -1)
491 72342dc9 2020-11-06 op goto childerr;
493 a5d310bc 2020-11-10 op if (asprintf(&requri, "%s%s%s", spath,
494 a5d310bc 2020-11-10 op *relpath == '\0' ? "" : "/",
495 a5d310bc 2020-11-10 op relpath) == -1)
496 a5d310bc 2020-11-10 op goto childerr;
498 a5d310bc 2020-11-10 op argv[0] = argv[1] = ex;
500 60ba426e 2020-11-06 op /* fix the env */
501 60ba426e 2020-11-06 op setenv("SERVER_SOFTWARE", "gmid", 1);
502 721e2325 2020-11-18 op setenv("SERVER_PORT", portno, 1);
503 a5d310bc 2020-11-10 op /* setenv("SERVER_NAME", "", 1); */
504 a5d310bc 2020-11-10 op setenv("SCRIPT_NAME", spath, 1);
505 a5d310bc 2020-11-10 op setenv("SCRIPT_EXECUTABLE", ex, 1);
506 a5d310bc 2020-11-10 op setenv("REQUEST_URI", requri, 1);
507 a5d310bc 2020-11-10 op setenv("REQUEST_RELATIVE", relpath, 1);
508 f65ed018 2020-11-06 op if (query != NULL)
509 f65ed018 2020-11-06 op setenv("QUERY_STRING", query, 1);
510 a5d310bc 2020-11-10 op setenv("REMOTE_HOST", addr, 1);
511 a5d310bc 2020-11-10 op setenv("DOCUMENT_ROOT", dir, 1);
513 a5d310bc 2020-11-10 op execvp(ex, argv);
514 72342dc9 2020-11-06 op goto childerr;
517 72342dc9 2020-11-06 op default: /* parent */
519 72342dc9 2020-11-06 op close(c->fd);
520 72342dc9 2020-11-06 op c->fd = p[0];
521 72342dc9 2020-11-06 op c->child = pid;
522 aff8d190 2020-11-06 op mark_nonblock(c->fd);
523 aff8d190 2020-11-06 op c->state = S_SENDING;
524 72342dc9 2020-11-06 op handle_cgi(fds, c);
529 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
531 72342dc9 2020-11-06 op goodbye(fds, c);
535 72342dc9 2020-11-06 op dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
541 aff8d190 2020-11-06 op cgi_setpoll_on_child(struct pollfd *fds, struct client *c)
545 aff8d190 2020-11-06 op if (c->waiting_on_child)
547 aff8d190 2020-11-06 op c->waiting_on_child = 1;
549 aff8d190 2020-11-06 op fds->events = POLLIN;
551 aff8d190 2020-11-06 op fd = fds->fd;
552 aff8d190 2020-11-06 op fds->fd = c->fd;
557 aff8d190 2020-11-06 op cgi_setpoll_on_client(struct pollfd *fds, struct client *c)
561 aff8d190 2020-11-06 op if (!c->waiting_on_child)
563 aff8d190 2020-11-06 op c->waiting_on_child = 0;
565 aff8d190 2020-11-06 op fd = fds->fd;
566 aff8d190 2020-11-06 op fds->fd = c->fd;
571 aff8d190 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
575 aff8d190 2020-11-06 op /* ensure c->fd is the child and fds->fd the client */
576 aff8d190 2020-11-06 op cgi_setpoll_on_client(fds, c);
579 aff8d190 2020-11-06 op if (c->len == 0) {
580 aff8d190 2020-11-06 op if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
582 aff8d190 2020-11-06 op if (r == -1) {
583 aff8d190 2020-11-06 op if (errno == EAGAIN || errno == EWOULDBLOCK) {
584 aff8d190 2020-11-06 op cgi_setpoll_on_child(fds, c);
593 aff8d190 2020-11-06 op while (c->len > 0) {
594 aff8d190 2020-11-06 op switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
598 72342dc9 2020-11-06 op case TLS_WANT_POLLOUT:
599 aff8d190 2020-11-06 op fds->events = POLLOUT;
602 72342dc9 2020-11-06 op case TLS_WANT_POLLIN:
603 aff8d190 2020-11-06 op fds->events = POLLIN;
615 72342dc9 2020-11-06 op goodbye(fds, c);
619 75d233f0 2020-11-06 op send_file(char *path, char *query, struct pollfd *fds, struct client *c)
621 f28f9311 2020-10-14 op ssize_t ret, len;
623 f28f9311 2020-10-14 op if (c->fd == -1) {
624 75d233f0 2020-11-06 op if (!open_file(path, query, fds, c))
626 f28f9311 2020-10-14 op c->state = S_SENDING;
629 f28f9311 2020-10-14 op len = (c->buf + c->len) - c->i;
631 f28f9311 2020-10-14 op while (len > 0) {
632 f28f9311 2020-10-14 op switch (ret = tls_write(c->ctx, c->i, len)) {
634 2c3a40fa 2020-11-06 op LOG(c, "tls_write: %s", tls_error(c->ctx));
635 f28f9311 2020-10-14 op goodbye(fds, c);
638 f28f9311 2020-10-14 op case TLS_WANT_POLLIN:
639 f28f9311 2020-10-14 op fds->events = POLLIN;
642 f28f9311 2020-10-14 op case TLS_WANT_POLLOUT:
643 f28f9311 2020-10-14 op fds->events = POLLOUT;
653 f28f9311 2020-10-14 op goodbye(fds, c);
657 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
659 3e4749f7 2020-10-02 op char fpath[PATHBUF];
662 3e4749f7 2020-10-02 op bzero(fpath, PATHBUF);
664 9c56b0a7 2020-10-14 op if (path[0] != '.')
665 3e4749f7 2020-10-02 op fpath[0] = '.';
667 3e4749f7 2020-10-02 op /* this cannot fail since sizeof(fpath) > maxlen of path */
668 3e4749f7 2020-10-02 op strlcat(fpath, path, PATHBUF);
669 3e4749f7 2020-10-02 op len = strlen(fpath);
671 3e4749f7 2020-10-02 op /* add a trailing / in case. */
672 3e4749f7 2020-10-02 op if (fpath[len-1] != '/') {
673 3e4749f7 2020-10-02 op fpath[len] = '/';
676 3e4749f7 2020-10-02 op strlcat(fpath, "index.gmi", sizeof(fpath));
678 75d233f0 2020-11-06 op send_file(fpath, NULL, fds, client);
682 592fd624 2020-10-07 op handle(struct pollfd *fds, struct client *client)
684 592fd624 2020-10-07 op char buf[GEMINI_URL_LEN];
688 592fd624 2020-10-07 op switch (client->state) {
690 592fd624 2020-10-07 op bzero(buf, GEMINI_URL_LEN);
691 592fd624 2020-10-07 op switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
693 2c3a40fa 2020-11-06 op LOG(client, "tls_read: %s", tls_error(client->ctx));
694 592fd624 2020-10-07 op goodbye(fds, client);
697 592fd624 2020-10-07 op case TLS_WANT_POLLIN:
698 592fd624 2020-10-07 op fds->events = POLLIN;
701 592fd624 2020-10-07 op case TLS_WANT_POLLOUT:
702 592fd624 2020-10-07 op fds->events = POLLOUT;
706 2c3a40fa 2020-11-06 op if (!url_trim(client, buf)) {
707 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
709 592fd624 2020-10-07 op goodbye(fds, client);
713 592fd624 2020-10-07 op if ((path = url_start_of_request(buf)) == NULL) {
714 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
716 592fd624 2020-10-07 op goodbye(fds, client);
720 aa0fe0cf 2020-11-06 op query = adjust_path(path);
721 aa0fe0cf 2020-11-06 op LOG(client, "get %s%s%s", path,
722 aa0fe0cf 2020-11-06 op query ? "?" : "",
723 aa0fe0cf 2020-11-06 op query ? query : "");
725 a5d310bc 2020-11-10 op send_file(path, query, fds, client);
728 592fd624 2020-10-07 op case S_INITIALIZING:
729 592fd624 2020-10-07 op if (!start_reply(fds, client, client->code, client->meta))
732 592fd624 2020-10-07 op if (client->code != SUCCESS) {
733 592fd624 2020-10-07 op /* we don't need a body */
734 592fd624 2020-10-07 op goodbye(fds, client);
738 592fd624 2020-10-07 op client->state = S_SENDING;
740 592fd624 2020-10-07 op /* fallthrough */
742 592fd624 2020-10-07 op case S_SENDING:
743 aff8d190 2020-11-06 op if (client->child != -1)
744 aff8d190 2020-11-06 op handle_cgi(fds, client);
746 aff8d190 2020-11-06 op send_file(NULL, NULL, fds, client);
749 592fd624 2020-10-07 op case S_CLOSING:
750 592fd624 2020-10-07 op goodbye(fds, client);
754 592fd624 2020-10-07 op /* unreachable */
760 592fd624 2020-10-07 op mark_nonblock(int fd)
764 592fd624 2020-10-07 op if ((flags = fcntl(fd, F_GETFL)) == -1)
765 592fd624 2020-10-07 op err(1, "fcntl(F_GETFL)");
766 592fd624 2020-10-07 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
767 592fd624 2020-10-07 op err(1, "fcntl(F_SETFL)");
771 9468027b 2020-10-15 op make_socket(int port, int family)
774 9468027b 2020-10-15 op struct sockaddr_in addr4;
775 9468027b 2020-10-15 op struct sockaddr_in6 addr6;
776 9468027b 2020-10-15 op struct sockaddr *addr;
777 9468027b 2020-10-15 op socklen_t len;
779 9468027b 2020-10-15 op switch (family) {
780 9468027b 2020-10-15 op case AF_INET:
781 9468027b 2020-10-15 op bzero(&addr4, sizeof(addr4));
782 9468027b 2020-10-15 op addr4.sin_family = family;
783 9468027b 2020-10-15 op addr4.sin_port = htons(port);
784 9468027b 2020-10-15 op addr4.sin_addr.s_addr = INADDR_ANY;
785 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr4;
786 9468027b 2020-10-15 op len = sizeof(addr4);
789 9468027b 2020-10-15 op case AF_INET6:
790 9468027b 2020-10-15 op bzero(&addr6, sizeof(addr6));
791 9468027b 2020-10-15 op addr6.sin6_family = AF_INET6;
792 9468027b 2020-10-15 op addr6.sin6_port = htons(port);
793 9468027b 2020-10-15 op addr6.sin6_addr = in6addr_any;
794 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr6;
795 9468027b 2020-10-15 op len = sizeof(addr6);
799 9468027b 2020-10-15 op /* unreachable */
803 9468027b 2020-10-15 op if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
804 f28f9311 2020-10-14 op err(1, "socket");
807 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
808 3e4749f7 2020-10-02 op err(1, "setsockopt(SO_REUSEADDR)");
811 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
812 3e4749f7 2020-10-02 op err(1, "setsockopt(SO_REUSEPORT)");
814 592fd624 2020-10-07 op mark_nonblock(sock);
816 9468027b 2020-10-15 op if (bind(sock, addr, len) == -1)
817 f28f9311 2020-10-14 op err(1, "bind");
819 3e4749f7 2020-10-02 op if (listen(sock, 16) == -1)
820 f28f9311 2020-10-14 op err(1, "listen");
826 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
829 592fd624 2020-10-07 op struct sockaddr_in addr;
830 3e4749f7 2020-10-02 op socklen_t len;
832 592fd624 2020-10-07 op len = sizeof(addr);
833 592fd624 2020-10-07 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
834 592fd624 2020-10-07 op if (errno == EWOULDBLOCK)
836 592fd624 2020-10-07 op err(1, "accept");
839 592fd624 2020-10-07 op mark_nonblock(fd);
841 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
842 592fd624 2020-10-07 op if (fds[i].fd == -1) {
843 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
844 592fd624 2020-10-07 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
845 592fd624 2020-10-07 op break; /* goodbye fd! */
847 592fd624 2020-10-07 op fds[i].fd = fd;
848 592fd624 2020-10-07 op fds[i].events = POLLIN;
850 592fd624 2020-10-07 op clients[i].state = S_OPEN;
851 592fd624 2020-10-07 op clients[i].fd = -1;
852 72342dc9 2020-11-06 op clients[i].child = -1;
853 f28f9311 2020-10-14 op clients[i].buf = MAP_FAILED;
854 2c3a40fa 2020-11-06 op clients[i].af = AF_INET;
855 2c3a40fa 2020-11-06 op clients[i].addr = addr.sin_addr;
857 120381c9 2020-11-06 op connected_clients++;
866 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
870 592fd624 2020-10-07 op c->state = S_CLOSING;
872 592fd624 2020-10-07 op ret = tls_close(c->ctx);
873 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
874 592fd624 2020-10-07 op pfd->events = POLLIN;
877 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
878 592fd624 2020-10-07 op pfd->events = POLLOUT;
882 120381c9 2020-11-06 op connected_clients--;
884 592fd624 2020-10-07 op tls_free(c->ctx);
885 592fd624 2020-10-07 op c->ctx = NULL;
887 f28f9311 2020-10-14 op if (c->buf != MAP_FAILED)
888 f28f9311 2020-10-14 op munmap(c->buf, c->len);
890 592fd624 2020-10-07 op if (c->fd != -1)
891 592fd624 2020-10-07 op close(c->fd);
893 592fd624 2020-10-07 op close(pfd->fd);
894 592fd624 2020-10-07 op pfd->fd = -1;
898 592fd624 2020-10-07 op loop(struct tls *ctx, int sock)
901 592fd624 2020-10-07 op struct client clients[MAX_USERS];
902 592fd624 2020-10-07 op struct pollfd fds[MAX_USERS];
904 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
905 592fd624 2020-10-07 op fds[i].fd = -1;
906 592fd624 2020-10-07 op fds[i].events = POLLIN;
907 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
910 592fd624 2020-10-07 op fds[0].fd = sock;
913 120381c9 2020-11-06 op if ((todo = poll(fds, MAX_USERS, INFTIM)) == -1) {
914 120381c9 2020-11-06 op if (errno == EINTR) {
915 120381c9 2020-11-06 op warnx("connected clients: %d", connected_clients);
918 592fd624 2020-10-07 op err(1, "poll");
921 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; i++) {
922 592fd624 2020-10-07 op assert(i < MAX_USERS);
924 592fd624 2020-10-07 op if (fds[i].revents == 0)
927 592fd624 2020-10-07 op if (fds[i].revents & (POLLERR|POLLNVAL))
928 592fd624 2020-10-07 op err(1, "bad fd %d", fds[i].fd);
930 592fd624 2020-10-07 op if (fds[i].revents & POLLHUP) {
931 aff8d190 2020-11-06 op /* fds[i] may be the fd of the stdin
932 aff8d190 2020-11-06 op * of a cgi script that has exited. */
933 aff8d190 2020-11-06 op if (!clients[i].waiting_on_child) {
934 aff8d190 2020-11-06 op goodbye(&fds[i], &clients[i]);
941 592fd624 2020-10-07 op if (i == 0) { /* new client */
942 592fd624 2020-10-07 op do_accept(sock, ctx, fds, clients);
946 592fd624 2020-10-07 op handle(&fds[i], &clients[i]);
952 3e4749f7 2020-10-02 op usage(const char *me)
954 3e4749f7 2020-10-02 op fprintf(stderr,
955 72f653b6 2020-11-06 op "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem] "
956 721e2325 2020-11-18 op "[-l logfile] [-p port] [-x cgi-bin]\n",
961 3e4749f7 2020-10-02 op main(int argc, char **argv)
963 72342dc9 2020-11-06 op const char *cert = "cert.pem", *key = "key.pem";
964 3e4749f7 2020-10-02 op struct tls *ctx = NULL;
965 3e4749f7 2020-10-02 op struct tls_config *conf;
966 3e4749f7 2020-10-02 op int sock, ch;
968 0cf902af 2020-11-03 op signal(SIGPIPE, SIG_IGN);
969 72342dc9 2020-11-06 op signal(SIGCHLD, SIG_IGN);
971 120381c9 2020-11-06 op #ifdef SIGINFO
972 120381c9 2020-11-06 op signal(SIGINFO, siginfo_handler);
974 120381c9 2020-11-06 op signal(SIGUSR2, siginfo_handler);
976 120381c9 2020-11-06 op connected_clients = 0;
978 72342dc9 2020-11-06 op dir = "docs/";
979 2c3a40fa 2020-11-06 op logfd = 2; /* stderr */
983 721e2325 2020-11-18 op while ((ch = getopt(argc, argv, "c:d:hk:l:p:x:")) != -1) {
984 3e4749f7 2020-10-02 op switch (ch) {
986 3e4749f7 2020-10-02 op cert = optarg;
990 3e4749f7 2020-10-02 op dir = optarg;
994 3e4749f7 2020-10-02 op usage(*argv);
998 3e4749f7 2020-10-02 op key = optarg;
1002 2c3a40fa 2020-11-06 op /* open log file or create it with 644 */
1003 e8cac16e 2020-11-06 op if ((logfd = open(optarg, O_WRONLY | O_CREAT | O_CLOEXEC,
1004 2c3a40fa 2020-11-06 op S_IRUSR | S_IWUSR | S_IRGRP | S_IWOTH)) == -1)
1005 2c3a40fa 2020-11-06 op err(1, "%s", optarg);
1013 721e2325 2020-11-18 op lval = strtol(optarg, &ep, 10);
1014 721e2325 2020-11-18 op if (optarg[0] == '\0' || *ep != '\0')
1015 721e2325 2020-11-18 op err(1, "not a number: %s", optarg);
1016 721e2325 2020-11-18 op if (lval < 0 || lval > UINT16_MAX)
1017 721e2325 2020-11-18 op err(1, "port number out of range: %s", optarg);
1018 721e2325 2020-11-18 op port = lval;
1023 72f653b6 2020-11-06 op cgi = optarg;
1027 3e4749f7 2020-10-02 op usage(*argv);
1032 3e4749f7 2020-10-02 op if ((conf = tls_config_new()) == NULL)
1033 3e4749f7 2020-10-02 op err(1, "tls_config_new");
1035 0d8ca45a 2020-10-03 op if (tls_config_set_protocols(conf,
1036 0d8ca45a 2020-10-03 op TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
1037 0d8ca45a 2020-10-03 op err(1, "tls_config_set_protocols");
1039 4d4f0e19 2020-10-03 op if (tls_config_set_cert_file(conf, cert) == -1)
1040 4d4f0e19 2020-10-03 op err(1, "tls_config_set_cert_file: %s", cert);
1042 4d4f0e19 2020-10-03 op if (tls_config_set_key_file(conf, key) == -1)
1043 4d4f0e19 2020-10-03 op err(1, "tls_config_set_key_file: %s", key);
1045 3e4749f7 2020-10-02 op if ((ctx = tls_server()) == NULL)
1046 3e4749f7 2020-10-02 op err(1, "tls_server");
1048 3e4749f7 2020-10-02 op if (tls_configure(ctx, conf) == -1)
1049 3e4749f7 2020-10-02 op errx(1, "tls_configure: %s", tls_error(ctx));
1051 721e2325 2020-11-18 op sock = make_socket(port, AF_INET);
1053 3e4749f7 2020-10-02 op if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
1054 3e4749f7 2020-10-02 op err(1, "open: %s", dir);
1056 72f653b6 2020-11-06 op if (cgi != NULL) {
1057 72f653b6 2020-11-06 op if (unveil(dir, "rx") == -1)
1058 72f653b6 2020-11-06 op err(1, "unveil");
1059 72f653b6 2020-11-06 op if (pledge("stdio rpath inet proc exec", NULL) == -1)
1060 72f653b6 2020-11-06 op err(1, "pledge");
1062 72f653b6 2020-11-06 op if (unveil(dir, "r") == -1)
1063 72f653b6 2020-11-06 op err(1, "unveil");
1064 72f653b6 2020-11-06 op if (pledge("stdio rpath inet", NULL) == -1)
1065 72f653b6 2020-11-06 op err(1, "pledge");
1068 3e4749f7 2020-10-02 op loop(ctx, sock);
1070 3e4749f7 2020-10-02 op close(sock);
1071 3e4749f7 2020-10-02 op tls_free(ctx);
1072 3e4749f7 2020-10-02 op tls_config_free(conf);
