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;
73 f28f9311 2020-10-14 op void *buf, *i;
74 f28f9311 2020-10-14 op ssize_t len, off;
76 2c3a40fa 2020-11-06 op struct in_addr addr;
79 cc68fe70 2020-10-07 op struct etm { /* file extension to mime */
80 cc68fe70 2020-10-07 op const char *mime;
81 cc68fe70 2020-10-07 op const char *ext;
82 cc68fe70 2020-10-07 op } filetypes[] = {
83 cc68fe70 2020-10-07 op {"application/pdf", "pdf"},
85 cc68fe70 2020-10-07 op {"image/gif", "gif"},
86 cc68fe70 2020-10-07 op {"image/jpeg", "jpg"},
87 cc68fe70 2020-10-07 op {"image/jpeg", "jpeg"},
88 cc68fe70 2020-10-07 op {"image/png", "png"},
89 cc68fe70 2020-10-07 op {"image/svg+xml", "svg"},
91 cc68fe70 2020-10-07 op {"text/gemini", "gemini"},
92 cc68fe70 2020-10-07 op {"text/gemini", "gmi"},
93 cc68fe70 2020-10-07 op {"text/markdown", "markdown"},
94 cc68fe70 2020-10-07 op {"text/markdown", "md"},
95 cc68fe70 2020-10-07 op {"text/plain", "txt"},
96 932b001a 2020-11-06 op {"text/xml", "xml"},
101 2c3a40fa 2020-11-06 op #define LOG(c, fmt, ...) \
103 2c3a40fa 2020-11-06 op char buf[INET_ADDRSTRLEN]; \
104 2c3a40fa 2020-11-06 op if (inet_ntop((c)->af, &(c)->addr, buf, sizeof(buf)) == NULL) \
105 2c3a40fa 2020-11-06 op err(1, "inet_ntop"); \
106 2c3a40fa 2020-11-06 op dprintf(logfd, "[%s] " fmt "\n", buf, __VA_ARGS__); \
109 72342dc9 2020-11-06 op const char *dir;
110 2c3a40fa 2020-11-06 op int dirfd, logfd;
113 592fd624 2020-10-07 op char *url_after_proto(char*);
114 592fd624 2020-10-07 op char *url_start_of_request(char*);
115 2c3a40fa 2020-11-06 op int url_trim(struct client*, char*);
116 592fd624 2020-10-07 op void adjust_path(char*);
117 592fd624 2020-10-07 op int path_isdir(char*);
118 f28f9311 2020-10-14 op ssize_t filesize(int);
120 592fd624 2020-10-07 op int start_reply(struct pollfd*, struct client*, int, const char*);
121 cc68fe70 2020-10-07 op const char *path_ext(const char*);
122 cc68fe70 2020-10-07 op const char *mime(const char*);
123 f28f9311 2020-10-14 op int open_file(char*, struct pollfd*, struct client*);
124 72342dc9 2020-11-06 op void start_cgi(const char*, struct pollfd*, struct client*);
125 72342dc9 2020-11-06 op void handle_cgi(struct pollfd*, struct client*);
126 592fd624 2020-10-07 op void send_file(char*, struct pollfd*, struct client*);
127 592fd624 2020-10-07 op void send_dir(char*, struct pollfd*, struct client*);
128 592fd624 2020-10-07 op void handle(struct pollfd*, struct client*);
130 592fd624 2020-10-07 op void mark_nonblock(int);
131 592fd624 2020-10-07 op int make_soket(int);
132 592fd624 2020-10-07 op void do_accept(int, struct tls*, struct pollfd*, struct client*);
133 592fd624 2020-10-07 op void goodbye(struct pollfd*, struct client*);
134 592fd624 2020-10-07 op void loop(struct tls*, int);
136 592fd624 2020-10-07 op void usage(const char*);
139 3e4749f7 2020-10-02 op url_after_proto(char *url)
142 3e4749f7 2020-10-02 op const char *proto = "gemini";
143 3e4749f7 2020-10-02 op const char *marker = "://";
145 3e4749f7 2020-10-02 op if ((s = strstr(url, marker)) == NULL)
148 3e4749f7 2020-10-02 op /* not a gemini:// URL */
150 3e4749f7 2020-10-02 op if (s - strlen(proto) < url)
153 3e4749f7 2020-10-02 op /* if (strcmp(s - strlen(proto), proto)) */
154 3e4749f7 2020-10-02 op /* return NULL; */
156 3e4749f7 2020-10-02 op /* a valid gemini:// URL */
157 3e4749f7 2020-10-02 op return s + strlen(marker);
161 3e4749f7 2020-10-02 op url_start_of_request(char *url)
165 3e4749f7 2020-10-02 op if ((s = url_after_proto(url)) == NULL)
168 3e4749f7 2020-10-02 op if ((t = strstr(s, "/")) == NULL)
169 3e4749f7 2020-10-02 op return s + strlen(s);
174 2c3a40fa 2020-11-06 op url_trim(struct client *c, char *url)
176 3e4749f7 2020-10-02 op const char *e = "\r\n";
179 3e4749f7 2020-10-02 op if ((s = strstr(url, e)) == NULL)
184 3e4749f7 2020-10-02 op if (s[2] != '\0') {
185 2c3a40fa 2020-11-06 op LOG(c, "%s", "request longer than 1024 bytes\n");
193 3e4749f7 2020-10-02 op adjust_path(char *path)
198 f28f9311 2020-10-14 op /* /.. -> / */
199 3e4749f7 2020-10-02 op len = strlen(path);
200 3e4749f7 2020-10-02 op if (len >= 3) {
201 3e4749f7 2020-10-02 op if (!strcmp(&path[len-3], "/..")) {
202 3e4749f7 2020-10-02 op path[len-2] = '\0';
206 3e4749f7 2020-10-02 op /* if the path is only `..` trim out and exit */
207 3e4749f7 2020-10-02 op if (!strcmp(path, "..")) {
208 3e4749f7 2020-10-02 op path[0] = '\0';
212 3e4749f7 2020-10-02 op /* remove every ../ in the path */
214 3e4749f7 2020-10-02 op if ((s = strstr(path, "../")) == NULL)
216 67328d23 2020-10-03 op memmove(s, s+3, strlen(s)+1); /* copy also the \0 */
221 3e4749f7 2020-10-02 op path_isdir(char *path)
223 3e4749f7 2020-10-02 op if (*path == '\0')
225 4d4f0e19 2020-10-03 op return path[strlen(path)-1] == '/';
229 592fd624 2020-10-07 op start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
231 3e4749f7 2020-10-02 op char buf[1030] = {0}; /* status + ' ' + max reply len + \r\n\0 */
235 592fd624 2020-10-07 op client->code = code;
236 592fd624 2020-10-07 op client->meta = reason;
237 592fd624 2020-10-07 op client->state = S_INITIALIZING;
239 3e4749f7 2020-10-02 op len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
240 3e4749f7 2020-10-02 op assert(len < (int)sizeof(buf));
241 592fd624 2020-10-07 op ret = tls_write(client->ctx, buf, len);
242 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
243 592fd624 2020-10-07 op pfd->events = POLLIN;
247 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
248 592fd624 2020-10-07 op pfd->events = POLLOUT;
256 f28f9311 2020-10-14 op filesize(int fd)
260 f28f9311 2020-10-14 op if ((len = lseek(fd, 0, SEEK_END)) == -1)
262 f28f9311 2020-10-14 op if (lseek(fd, 0, SEEK_SET) == -1)
268 cc68fe70 2020-10-07 op path_ext(const char *path)
270 cc68fe70 2020-10-07 op const char *end;
272 cc68fe70 2020-10-07 op end = path + strlen(path)-1; /* the last byte before the NUL */
273 cc68fe70 2020-10-07 op for (; end != path; --end) {
274 cc68fe70 2020-10-07 op if (*end == '.')
275 cc68fe70 2020-10-07 op return end+1;
276 cc68fe70 2020-10-07 op if (*end == '/')
284 cc68fe70 2020-10-07 op mime(const char *path)
286 cc68fe70 2020-10-07 op const char *ext, *def = "application/octet-stream";
287 cc68fe70 2020-10-07 op struct etm *t;
289 cc68fe70 2020-10-07 op if ((ext = path_ext(path)) == NULL)
292 cc68fe70 2020-10-07 op for (t = filetypes; t->mime != NULL; ++t)
293 cc68fe70 2020-10-07 op if (!strcmp(ext, t->ext))
294 cc68fe70 2020-10-07 op return t->mime;
300 f28f9311 2020-10-14 op open_file(char *path, struct pollfd *fds, struct client *c)
302 3e4749f7 2020-10-02 op char fpath[PATHBUF];
303 72342dc9 2020-11-06 op struct stat sb;
305 f28f9311 2020-10-14 op assert(path != NULL);
307 f28f9311 2020-10-14 op bzero(fpath, sizeof(fpath));
309 f28f9311 2020-10-14 op if (*path != '.')
310 f28f9311 2020-10-14 op fpath[0] = '.';
311 f28f9311 2020-10-14 op strlcat(fpath, path, PATHBUF);
313 f28f9311 2020-10-14 op if ((c->fd = openat(dirfd, fpath, O_RDONLY | O_NOFOLLOW)) == -1) {
314 2c3a40fa 2020-11-06 op LOG(c, "open failed: %s", fpath);
315 f28f9311 2020-10-14 op if (!start_reply(fds, c, NOT_FOUND, "not found"))
317 f28f9311 2020-10-14 op goodbye(fds, c);
321 72342dc9 2020-11-06 op if (fstat(c->fd, &sb) == -1) {
322 72342dc9 2020-11-06 op LOG(c, "fstat failed for %s", fpath);
323 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
325 72342dc9 2020-11-06 op goodbye(fds, c);
329 72342dc9 2020-11-06 op if (S_ISDIR(sb.st_mode)) {
330 2c3a40fa 2020-11-06 op LOG(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
331 f28f9311 2020-10-14 op close(c->fd);
333 f28f9311 2020-10-14 op send_dir(fpath, fds, c);
337 72342dc9 2020-11-06 op if (cgi && (sb.st_mode & S_IXUSR)) {
338 72342dc9 2020-11-06 op start_cgi(fpath, fds, c);
342 f28f9311 2020-10-14 op if ((c->len = filesize(c->fd)) == -1) {
343 2c3a40fa 2020-11-06 op LOG(c, "failed to get file size for %s", fpath);
344 f28f9311 2020-10-14 op goodbye(fds, c);
348 f28f9311 2020-10-14 op if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
349 f28f9311 2020-10-14 op c->fd, 0)) == MAP_FAILED) {
350 f28f9311 2020-10-14 op warn("mmap: %s", fpath);
351 f28f9311 2020-10-14 op goodbye(fds, c);
354 f28f9311 2020-10-14 op c->i = c->buf;
356 f28f9311 2020-10-14 op return start_reply(fds, c, SUCCESS, mime(fpath));
360 72342dc9 2020-11-06 op start_cgi(const char *path, struct pollfd *fds, struct client *c)
365 72342dc9 2020-11-06 op if (pipe(p) == -1)
368 72342dc9 2020-11-06 op switch (pid = fork()) {
372 72342dc9 2020-11-06 op case 0: { /* child */
373 72342dc9 2020-11-06 op char *expath;
374 72342dc9 2020-11-06 op char addr[INET_ADDRSTRLEN];
375 72342dc9 2020-11-06 op char *argv[] = { NULL, NULL, NULL };
376 72342dc9 2020-11-06 op char *envp[] = {
377 72342dc9 2020-11-06 op /* inherited */
381 72342dc9 2020-11-06 op "SERVER_SOFTWARE=gmid",
382 72342dc9 2020-11-06 op /* "SERVER_NAME=example.com", */
383 72342dc9 2020-11-06 op /* "GATEWAY_INTERFACE=CGI/version" */
384 72342dc9 2020-11-06 op "SERVER_PROTOCOL=gemini",
385 72342dc9 2020-11-06 op "SERVER_PORT=1965",
386 72342dc9 2020-11-06 op /* "PATH_INFO=" */
387 72342dc9 2020-11-06 op /* "PATH_TRANSLATED=" */
388 72342dc9 2020-11-06 op /* "SCRIPT_NAME=" */
389 72342dc9 2020-11-06 op /* "QUERY_STRING=" */
390 72342dc9 2020-11-06 op "REMOTE_ADDR=",
395 72342dc9 2020-11-06 op close(p[0]); /* close the read end */
396 72342dc9 2020-11-06 op if (dup2(p[1], 1) == -1)
397 72342dc9 2020-11-06 op goto childerr;
399 72342dc9 2020-11-06 op if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
400 72342dc9 2020-11-06 op goto childerr;
402 72342dc9 2020-11-06 op /* skip the ./ at the start of path*/
403 72342dc9 2020-11-06 op if (asprintf(&expath, "%s%s", dir, path+2) == -1)
404 72342dc9 2020-11-06 op goto childerr;
405 72342dc9 2020-11-06 op argv[0] = argv[1] = expath;
407 72342dc9 2020-11-06 op /* fix the envp */
408 72342dc9 2020-11-06 op for (i = 0; envp[i] != NULL; ++i) {
409 72342dc9 2020-11-06 op if (!strcmp(envp[i], "PATH="))
410 72342dc9 2020-11-06 op envp[i] = getenv("PATH");
411 72342dc9 2020-11-06 op else if (!strcmp(envp[i], "REMOTE_ADDR="))
412 72342dc9 2020-11-06 op envp[i] = addr;
413 72342dc9 2020-11-06 op /* else if (!strcmp(envp[i], "PATH_INFO")) */
417 72342dc9 2020-11-06 op execvpe(expath, argv, envp);
418 72342dc9 2020-11-06 op goto childerr;
421 72342dc9 2020-11-06 op default: /* parent */
422 72342dc9 2020-11-06 op close(p[1]); /* close the write end */
423 72342dc9 2020-11-06 op close(c->fd);
424 72342dc9 2020-11-06 op c->fd = p[0];
425 72342dc9 2020-11-06 op c->child = pid;
426 72342dc9 2020-11-06 op handle_cgi(fds, c);
431 72342dc9 2020-11-06 op if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
433 72342dc9 2020-11-06 op goodbye(fds, c);
437 72342dc9 2020-11-06 op dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
443 72342dc9 2020-11-06 op handle_cgi(struct pollfd *fds, struct client *c)
445 72342dc9 2020-11-06 op char buf[1024];
446 72342dc9 2020-11-06 op ssize_t r, todo;
449 72342dc9 2020-11-06 op r = read(c->fd, buf, sizeof(buf));
450 72342dc9 2020-11-06 op if (r == -1 || r == 0)
453 72342dc9 2020-11-06 op while (todo > 0) {
454 72342dc9 2020-11-06 op switch (r = tls_write(c->ctx, buf, todo)) {
458 72342dc9 2020-11-06 op case TLS_WANT_POLLOUT:
459 72342dc9 2020-11-06 op case TLS_WANT_POLLIN:
470 72342dc9 2020-11-06 op goodbye(fds, c);
474 f28f9311 2020-10-14 op send_file(char *path, struct pollfd *fds, struct client *c)
476 f28f9311 2020-10-14 op ssize_t ret, len;
478 f28f9311 2020-10-14 op if (c->fd == -1) {
479 f28f9311 2020-10-14 op if (!open_file(path, fds, c))
481 f28f9311 2020-10-14 op c->state = S_SENDING;
484 f28f9311 2020-10-14 op len = (c->buf + c->len) - c->i;
486 f28f9311 2020-10-14 op while (len > 0) {
487 f28f9311 2020-10-14 op switch (ret = tls_write(c->ctx, c->i, len)) {
489 2c3a40fa 2020-11-06 op LOG(c, "tls_write: %s", tls_error(c->ctx));
490 f28f9311 2020-10-14 op goodbye(fds, c);
493 f28f9311 2020-10-14 op case TLS_WANT_POLLIN:
494 f28f9311 2020-10-14 op fds->events = POLLIN;
497 f28f9311 2020-10-14 op case TLS_WANT_POLLOUT:
498 f28f9311 2020-10-14 op fds->events = POLLOUT;
508 f28f9311 2020-10-14 op goodbye(fds, c);
512 592fd624 2020-10-07 op send_dir(char *path, struct pollfd *fds, struct client *client)
514 3e4749f7 2020-10-02 op char fpath[PATHBUF];
517 3e4749f7 2020-10-02 op bzero(fpath, PATHBUF);
519 9c56b0a7 2020-10-14 op if (path[0] != '.')
520 3e4749f7 2020-10-02 op fpath[0] = '.';
522 3e4749f7 2020-10-02 op /* this cannot fail since sizeof(fpath) > maxlen of path */
523 3e4749f7 2020-10-02 op strlcat(fpath, path, PATHBUF);
524 3e4749f7 2020-10-02 op len = strlen(fpath);
526 3e4749f7 2020-10-02 op /* add a trailing / in case. */
527 3e4749f7 2020-10-02 op if (fpath[len-1] != '/') {
528 3e4749f7 2020-10-02 op fpath[len] = '/';
531 3e4749f7 2020-10-02 op strlcat(fpath, "index.gmi", sizeof(fpath));
533 592fd624 2020-10-07 op send_file(fpath, fds, client);
537 592fd624 2020-10-07 op handle(struct pollfd *fds, struct client *client)
539 592fd624 2020-10-07 op char buf[GEMINI_URL_LEN];
542 592fd624 2020-10-07 op switch (client->state) {
544 592fd624 2020-10-07 op bzero(buf, GEMINI_URL_LEN);
545 592fd624 2020-10-07 op switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
547 2c3a40fa 2020-11-06 op LOG(client, "tls_read: %s", tls_error(client->ctx));
548 592fd624 2020-10-07 op goodbye(fds, client);
551 592fd624 2020-10-07 op case TLS_WANT_POLLIN:
552 592fd624 2020-10-07 op fds->events = POLLIN;
555 592fd624 2020-10-07 op case TLS_WANT_POLLOUT:
556 592fd624 2020-10-07 op fds->events = POLLOUT;
560 2c3a40fa 2020-11-06 op if (!url_trim(client, buf)) {
561 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
563 592fd624 2020-10-07 op goodbye(fds, client);
567 592fd624 2020-10-07 op if ((path = url_start_of_request(buf)) == NULL) {
568 592fd624 2020-10-07 op if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
570 592fd624 2020-10-07 op goodbye(fds, client);
574 592fd624 2020-10-07 op adjust_path(path);
575 2c3a40fa 2020-11-06 op LOG(client, "get %s", path);
577 592fd624 2020-10-07 op if (path_isdir(path))
578 592fd624 2020-10-07 op send_dir(path, fds, client);
580 592fd624 2020-10-07 op send_file(path, fds, client);
583 592fd624 2020-10-07 op case S_INITIALIZING:
584 592fd624 2020-10-07 op if (!start_reply(fds, client, client->code, client->meta))
587 592fd624 2020-10-07 op if (client->code != SUCCESS) {
588 592fd624 2020-10-07 op /* we don't need a body */
589 592fd624 2020-10-07 op goodbye(fds, client);
593 592fd624 2020-10-07 op client->state = S_SENDING;
595 592fd624 2020-10-07 op /* fallthrough */
597 592fd624 2020-10-07 op case S_SENDING:
598 592fd624 2020-10-07 op send_file(NULL, fds, client);
601 592fd624 2020-10-07 op case S_CLOSING:
602 592fd624 2020-10-07 op goodbye(fds, client);
606 592fd624 2020-10-07 op /* unreachable */
612 592fd624 2020-10-07 op mark_nonblock(int fd)
616 592fd624 2020-10-07 op if ((flags = fcntl(fd, F_GETFL)) == -1)
617 592fd624 2020-10-07 op err(1, "fcntl(F_GETFL)");
618 592fd624 2020-10-07 op if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
619 592fd624 2020-10-07 op err(1, "fcntl(F_SETFL)");
623 9468027b 2020-10-15 op make_socket(int port, int family)
626 9468027b 2020-10-15 op struct sockaddr_in addr4;
627 9468027b 2020-10-15 op struct sockaddr_in6 addr6;
628 9468027b 2020-10-15 op struct sockaddr *addr;
629 9468027b 2020-10-15 op socklen_t len;
631 9468027b 2020-10-15 op switch (family) {
632 9468027b 2020-10-15 op case AF_INET:
633 9468027b 2020-10-15 op bzero(&addr4, sizeof(addr4));
634 9468027b 2020-10-15 op addr4.sin_family = family;
635 9468027b 2020-10-15 op addr4.sin_port = htons(port);
636 9468027b 2020-10-15 op addr4.sin_addr.s_addr = INADDR_ANY;
637 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr4;
638 9468027b 2020-10-15 op len = sizeof(addr4);
641 9468027b 2020-10-15 op case AF_INET6:
642 9468027b 2020-10-15 op bzero(&addr6, sizeof(addr6));
643 9468027b 2020-10-15 op addr6.sin6_family = AF_INET6;
644 9468027b 2020-10-15 op addr6.sin6_port = htons(port);
645 9468027b 2020-10-15 op addr6.sin6_addr = in6addr_any;
646 9468027b 2020-10-15 op addr = (struct sockaddr*)&addr6;
647 9468027b 2020-10-15 op len = sizeof(addr6);
651 9468027b 2020-10-15 op /* unreachable */
655 9468027b 2020-10-15 op if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
656 f28f9311 2020-10-14 op err(1, "socket");
659 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
660 3e4749f7 2020-10-02 op err(1, "setsockopt(SO_REUSEADDR)");
663 3e4749f7 2020-10-02 op if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
664 3e4749f7 2020-10-02 op err(1, "setsockopt(SO_REUSEPORT)");
666 592fd624 2020-10-07 op mark_nonblock(sock);
668 9468027b 2020-10-15 op if (bind(sock, addr, len) == -1)
669 f28f9311 2020-10-14 op err(1, "bind");
671 3e4749f7 2020-10-02 op if (listen(sock, 16) == -1)
672 f28f9311 2020-10-14 op err(1, "listen");
678 592fd624 2020-10-07 op do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
681 592fd624 2020-10-07 op struct sockaddr_in addr;
682 3e4749f7 2020-10-02 op socklen_t len;
684 592fd624 2020-10-07 op len = sizeof(addr);
685 592fd624 2020-10-07 op if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
686 592fd624 2020-10-07 op if (errno == EWOULDBLOCK)
688 592fd624 2020-10-07 op err(1, "accept");
691 592fd624 2020-10-07 op mark_nonblock(fd);
693 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
694 592fd624 2020-10-07 op if (fds[i].fd == -1) {
695 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
696 592fd624 2020-10-07 op if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
697 592fd624 2020-10-07 op break; /* goodbye fd! */
699 592fd624 2020-10-07 op fds[i].fd = fd;
700 592fd624 2020-10-07 op fds[i].events = POLLIN;
702 592fd624 2020-10-07 op clients[i].state = S_OPEN;
703 592fd624 2020-10-07 op clients[i].fd = -1;
704 72342dc9 2020-11-06 op clients[i].child = -1;
705 f28f9311 2020-10-14 op clients[i].buf = MAP_FAILED;
706 2c3a40fa 2020-11-06 op clients[i].af = AF_INET;
707 2c3a40fa 2020-11-06 op clients[i].addr = addr.sin_addr;
717 592fd624 2020-10-07 op goodbye(struct pollfd *pfd, struct client *c)
721 592fd624 2020-10-07 op c->state = S_CLOSING;
723 592fd624 2020-10-07 op ret = tls_close(c->ctx);
724 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLIN) {
725 592fd624 2020-10-07 op pfd->events = POLLIN;
728 592fd624 2020-10-07 op if (ret == TLS_WANT_POLLOUT) {
729 592fd624 2020-10-07 op pfd->events = POLLOUT;
733 592fd624 2020-10-07 op tls_free(c->ctx);
734 592fd624 2020-10-07 op c->ctx = NULL;
736 f28f9311 2020-10-14 op if (c->buf != MAP_FAILED)
737 f28f9311 2020-10-14 op munmap(c->buf, c->len);
739 592fd624 2020-10-07 op if (c->fd != -1)
740 592fd624 2020-10-07 op close(c->fd);
742 592fd624 2020-10-07 op close(pfd->fd);
743 592fd624 2020-10-07 op pfd->fd = -1;
747 592fd624 2020-10-07 op loop(struct tls *ctx, int sock)
750 592fd624 2020-10-07 op struct client clients[MAX_USERS];
751 592fd624 2020-10-07 op struct pollfd fds[MAX_USERS];
753 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; ++i) {
754 592fd624 2020-10-07 op fds[i].fd = -1;
755 592fd624 2020-10-07 op fds[i].events = POLLIN;
756 592fd624 2020-10-07 op bzero(&clients[i], sizeof(struct client));
759 592fd624 2020-10-07 op fds[0].fd = sock;
762 f28f9311 2020-10-14 op if ((todo = poll(fds, MAX_USERS, INFTIM)) == -1)
763 592fd624 2020-10-07 op err(1, "poll");
765 592fd624 2020-10-07 op for (i = 0; i < MAX_USERS; i++) {
766 592fd624 2020-10-07 op assert(i < MAX_USERS);
768 592fd624 2020-10-07 op if (fds[i].revents == 0)
771 592fd624 2020-10-07 op if (fds[i].revents & (POLLERR|POLLNVAL))
772 592fd624 2020-10-07 op err(1, "bad fd %d", fds[i].fd);
774 592fd624 2020-10-07 op if (fds[i].revents & POLLHUP) {
775 592fd624 2020-10-07 op goodbye(&fds[i], &clients[i]);
781 592fd624 2020-10-07 op if (i == 0) { /* new client */
782 592fd624 2020-10-07 op do_accept(sock, ctx, fds, clients);
786 592fd624 2020-10-07 op handle(&fds[i], &clients[i]);
792 3e4749f7 2020-10-02 op usage(const char *me)
794 3e4749f7 2020-10-02 op fprintf(stderr,
795 3e4749f7 2020-10-02 op "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem]\n",
800 3e4749f7 2020-10-02 op main(int argc, char **argv)
802 72342dc9 2020-11-06 op const char *cert = "cert.pem", *key = "key.pem";
803 3e4749f7 2020-10-02 op struct tls *ctx = NULL;
804 3e4749f7 2020-10-02 op struct tls_config *conf;
805 3e4749f7 2020-10-02 op int sock, ch;
807 0cf902af 2020-11-03 op signal(SIGPIPE, SIG_IGN);
808 72342dc9 2020-11-06 op signal(SIGCHLD, SIG_IGN);
810 72342dc9 2020-11-06 op dir = "docs/";
811 2c3a40fa 2020-11-06 op logfd = 2; /* stderr */
814 72342dc9 2020-11-06 op while ((ch = getopt(argc, argv, "c:d:hk:l:x")) != -1) {
815 3e4749f7 2020-10-02 op switch (ch) {
817 3e4749f7 2020-10-02 op cert = optarg;
821 3e4749f7 2020-10-02 op dir = optarg;
825 3e4749f7 2020-10-02 op usage(*argv);
829 3e4749f7 2020-10-02 op key = optarg;
833 2c3a40fa 2020-11-06 op /* open log file or create it with 644 */
834 2c3a40fa 2020-11-06 op if ((logfd = open(optarg, O_WRONLY | O_CREAT,
835 2c3a40fa 2020-11-06 op S_IRUSR | S_IWUSR | S_IRGRP | S_IWOTH)) == -1)
836 2c3a40fa 2020-11-06 op err(1, "%s", optarg);
844 3e4749f7 2020-10-02 op usage(*argv);
849 3e4749f7 2020-10-02 op if ((conf = tls_config_new()) == NULL)
850 3e4749f7 2020-10-02 op err(1, "tls_config_new");
852 0d8ca45a 2020-10-03 op if (tls_config_set_protocols(conf,
853 0d8ca45a 2020-10-03 op TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
854 0d8ca45a 2020-10-03 op err(1, "tls_config_set_protocols");
856 4d4f0e19 2020-10-03 op if (tls_config_set_cert_file(conf, cert) == -1)
857 4d4f0e19 2020-10-03 op err(1, "tls_config_set_cert_file: %s", cert);
859 4d4f0e19 2020-10-03 op if (tls_config_set_key_file(conf, key) == -1)
860 4d4f0e19 2020-10-03 op err(1, "tls_config_set_key_file: %s", key);
862 3e4749f7 2020-10-02 op if ((ctx = tls_server()) == NULL)
863 3e4749f7 2020-10-02 op err(1, "tls_server");
865 3e4749f7 2020-10-02 op if (tls_configure(ctx, conf) == -1)
866 3e4749f7 2020-10-02 op errx(1, "tls_configure: %s", tls_error(ctx));
868 9468027b 2020-10-15 op sock = make_socket(1965, AF_INET);
870 3e4749f7 2020-10-02 op if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
871 3e4749f7 2020-10-02 op err(1, "open: %s", dir);
873 72342dc9 2020-11-06 op if (unveil(dir, cgi ? "rx" : "r") == -1)
874 3e4749f7 2020-10-02 op err(1, "unveil");
876 72342dc9 2020-11-06 op if (pledge(cgi ? "stdio rpath inet proc exec" : "stdio rpath inet", NULL) == -1)
877 3e4749f7 2020-10-02 op err(1, "pledge");
879 3e4749f7 2020-10-02 op loop(ctx, sock);
882 3e4749f7 2020-10-02 op tls_free(ctx);
883 3e4749f7 2020-10-02 op tls_config_free(conf);