mirror of
https://github.com/omar-polo/gmid.git
synced 2024-09-03 10:07:20 +02:00
417 lines
7.6 KiB
C
417 lines
7.6 KiB
C
/*
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* Copyright (c) 2020 Omar Polo <op@omarpolo.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <assert.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <tls.h>
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#include <unistd.h>
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#ifndef __OpenBSD__
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# define pledge(a, b) 0
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# define unveil(a, b) 0
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#endif /* __OpenBSD__ */
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#define GEMINI_URL_LEN (1024+3) /* URL max len + \r\n + \0 */
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/* large enough to hold a copy of a gemini URL and still have extra room */
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#define PATHBUF (2048)
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#define FILEBUF 1024
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#define SUCCESS 20
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#define NOT_FOUND 51
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#define BAD_REQUEST 59
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int dirfd;
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char *
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url_after_proto(char *url)
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{
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char *s;
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const char *proto = "gemini";
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const char *marker = "://";
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if ((s = strstr(url, marker)) == NULL)
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return url;
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/* not a gemini:// URL */
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if (s - strlen(proto) < url)
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return NULL;
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/* TODO: */
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/* if (strcmp(s - strlen(proto), proto)) */
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/* return NULL; */
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/* a valid gemini:// URL */
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return s + strlen(marker);
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}
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char *
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url_start_of_request(char *url)
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{
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char *s, *t;
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if ((s = url_after_proto(url)) == NULL)
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return NULL;
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if ((t = strstr(s, "/")) == NULL)
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return s + strlen(s);
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return t;
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}
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int
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url_trim(char *url)
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{
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const char *e = "\r\n";
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char *s;
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if ((s = strstr(url, e)) == NULL)
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return 0;
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s[0] = '\0';
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s[1] = '\0';
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if (s[2] != '\0') {
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fprintf(stderr, "the request was longer than 1024 bytes\n");
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return 0;
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}
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return 1;
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}
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void
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adjust_path(char *path)
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{
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char *s;
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size_t len;
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/* /.. -> / */
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len = strlen(path);
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if (len >= 3) {
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if (!strcmp(&path[len-3], "/..")) {
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path[len-2] = '\0';
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}
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}
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/* if the path is only `..` trim out and exit */
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if (!strcmp(path, "..")) {
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path[0] = '\0';
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return;
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}
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/* remove every ../ in the path */
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while (1) {
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if ((s = strstr(path, "../")) == NULL)
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return;
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memmove(s, s+3, strlen(s)+1); /* copy also the \0 */
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}
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}
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int
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path_isdir(char *path)
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{
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if (*path == '\0')
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return 1;
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return path[strlen(path)-1] == '/';
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}
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void
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start_reply(struct tls *ctx, int code, const char *reason)
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{
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char buf[1030] = {0}; /* status + ' ' + max reply len + \r\n\0 */
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int len;
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len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
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assert(len < (int)sizeof(buf));
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tls_write(ctx, buf, len);
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}
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int
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isdir(int fd)
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{
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struct stat sb;
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if (fstat(fd, &sb) == -1) {
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warn("fstat");
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return 1; /* we'll probably fail later on anyway */
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}
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return S_ISDIR(sb.st_mode);
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}
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void send_dir(char*, struct tls*);
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void
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send_file(char *path, struct tls *ctx)
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{
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int fd;
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char fpath[PATHBUF];
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char buf[FILEBUF];
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size_t i;
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ssize_t t, w;
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bzero(fpath, sizeof(fpath));
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if (*path != '.')
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fpath[0] = '.';
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strlcat(fpath, path, PATHBUF);
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if ((fd = openat(dirfd, fpath, O_RDONLY | O_NOFOLLOW)) == -1) {
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warn("open: %s", fpath);
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start_reply(ctx, NOT_FOUND, "not found");
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return;
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}
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if (isdir(fd)) {
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warnx("%s is a directory, trying %s/index.gmi", fpath, fpath);
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close(fd);
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send_dir(fpath, ctx);
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return;
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}
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/* assume it's a text/gemini file */
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start_reply(ctx, SUCCESS, "text/gemini");
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while (1) {
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if ((w = read(fd, buf, sizeof(buf))) == -1) {
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warn("read: %s", fpath);
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goto exit;
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}
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if (w == 0)
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break;
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t = w;
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i = 0;
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while (w > 0) {
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if ((t = tls_write(ctx, buf + i, w)) == -1) {
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warnx("tls_write (path=%s) : %s",
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fpath,
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tls_error(ctx));
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goto exit;
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}
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w -= t;
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i += t;
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}
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}
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exit:
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close(fd);
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}
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void
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send_dir(char *path, struct tls *ctx)
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{
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char fpath[PATHBUF];
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size_t len;
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bzero(fpath, PATHBUF);
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if (*path != '.')
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fpath[0] = '.';
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/* this cannot fail since sizeof(fpath) > maxlen of path */
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strlcat(fpath, path, PATHBUF);
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len = strlen(fpath);
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/* add a trailing / in case. */
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if (fpath[len-1] != '/') {
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fpath[len] = '/';
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}
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strlcat(fpath, "index.gmi", sizeof(fpath));
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send_file(fpath, ctx);
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}
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void
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handle(char *url, struct tls *ctx)
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{
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char *path;
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if (!url_trim(url)) {
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start_reply(ctx, BAD_REQUEST, "bad request");
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return;
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}
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if ((path = url_start_of_request(url)) == NULL) {
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start_reply(ctx, BAD_REQUEST, "bad request");
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return;
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}
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adjust_path(path);
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fprintf(stderr, "requested path: %s\n", path);
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if (path_isdir(path))
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send_dir(path, ctx);
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else
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send_file(path, ctx);
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}
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int
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make_socket(int port)
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{
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int sock, v;
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struct sockaddr_in addr;
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if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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err(1, "socket");
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v = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
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err(1, "setsockopt(SO_REUSEADDR)");
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v = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
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err(1, "setsockopt(SO_REUSEPORT)");
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bzero(&addr, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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addr.sin_addr.s_addr = INADDR_ANY;
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if (bind(sock, (struct sockaddr*)&addr, sizeof(addr)) == -1)
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err(1, "bind");
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if (listen(sock, 16) == -1)
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err(1, "listen");
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return sock;
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}
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void
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loop(struct tls *ctx, int sock)
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{
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int fd;
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struct sockaddr_in client;
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socklen_t len;
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struct tls *clientctx;
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char buf[GEMINI_URL_LEN];
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for (;;) {
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len = sizeof(client);
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if ((fd = accept(sock, (struct sockaddr*)&client, &len)) == -1)
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err(1, "accept");
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if (tls_accept_socket(ctx, &clientctx, fd) == -1) {
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warnx("tls_accept_socket: %s", tls_error(ctx));
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continue;
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}
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bzero(buf, GEMINI_URL_LEN);
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if (tls_read(clientctx, buf, sizeof(buf)-1) == -1) {
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warnx("tls_read: %s", tls_error(clientctx));
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goto clientend;
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}
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handle(buf, clientctx);
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clientend:
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if (tls_close(clientctx) == -1)
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warn("tls_close: client");
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tls_free(clientctx);
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close(fd);
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}
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}
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void
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usage(const char *me)
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{
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fprintf(stderr,
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"USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem]\n",
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me);
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}
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int
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main(int argc, char **argv)
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{
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const char *cert = "cert.pem", *key = "key.pem", *dir = "docs";
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struct tls *ctx = NULL;
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struct tls_config *conf;
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int sock, ch;
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while ((ch = getopt(argc, argv, "c:d:hk:")) != -1) {
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switch (ch) {
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case 'c':
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cert = optarg;
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break;
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case 'd':
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dir = optarg;
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break;
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case 'h':
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usage(*argv);
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return 0;
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case 'k':
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key = optarg;
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break;
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default:
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usage(*argv);
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return 1;
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}
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}
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if ((conf = tls_config_new()) == NULL)
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err(1, "tls_config_new");
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if (tls_config_set_protocols(conf,
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TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
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err(1, "tls_config_set_protocols");
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if (tls_config_set_cert_file(conf, cert) == -1)
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err(1, "tls_config_set_cert_file: %s", cert);
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if (tls_config_set_key_file(conf, key) == -1)
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err(1, "tls_config_set_key_file: %s", key);
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if ((ctx = tls_server()) == NULL)
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err(1, "tls_server");
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if (tls_configure(ctx, conf) == -1)
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errx(1, "tls_configure: %s", tls_error(ctx));
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sock = make_socket(1965);
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if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
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err(1, "open: %s", dir);
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if (unveil(dir, "r") == -1)
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err(1, "unveil");
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if (pledge("stdio rpath inet", "") == -1)
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err(1, "pledge");
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loop(ctx, sock);
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close(sock);
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tls_free(ctx);
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tls_config_free(conf);
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}
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