1 /*
2  * Copyright (c) 2022 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "gmid.h"
18 
19 #include <sys/stat.h>
20 #include <sys/wait.h>
21 
22 #include <errno.h>
23 #include <fcntl.h>
24 #include <getopt.h>
25 #include <locale.h>
26 #include <libgen.h>
27 #include <signal.h>
28 #include <string.h>
29 #include <syslog.h>
30 #include <unistd.h>
31 
32 #include "log.h"
33 
34 struct conf conf;
35 int privsep_process;
36 
37 struct fcgi fcgi[FCGI_MAX];	/* just because it's referenced */
38 struct vhosthead hosts = TAILQ_HEAD_INITIALIZER(hosts);
39 
40 static const struct option opts[] = {
41 	{"help",	no_argument,	NULL,	'h'},
42 	{"version",	no_argument,	NULL,	'V'},
43 	{NULL,		0,		NULL,	0},
44 };
45 
46 void
47 log_request(struct client *c, char *meta, size_t l)
48 {
49 	char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV], b[GEMINI_URL_LEN];
50 	const char *t;
51 	size_t len;
52 	int ec;
53 
54 	len = sizeof(c->addr);
55 	ec = getnameinfo((struct sockaddr*)&c->addr, len,
56 	    hbuf, sizeof(hbuf),
57 	    sbuf, sizeof(sbuf),
58 	    NI_NUMERICHOST | NI_NUMERICSERV);
59 	if (ec != 0)
60 		fatalx("getnameinfo: %s", gai_strerror(ec));
61 
62 	if (c->iri.schema != NULL) {
63 		/* serialize the IRI */
64 		strlcpy(b, c->iri.schema, sizeof(b));
65 		strlcat(b, "://", sizeof(b));
66 
67 		/* log the decoded host name, but if it was invalid
68 		 * use the raw one. */
69 		if (*c->domain != '\0')
70 			strlcat(b, c->domain, sizeof(b));
71 		else
72 			strlcat(b, c->iri.host, sizeof(b));
73 
74 		if (*c->iri.path != '/')
75 			strlcat(b, "/", sizeof(b));
76 		strlcat(b, c->iri.path, sizeof(b)); /* TODO: sanitize UTF8 */
77 		if (*c->iri.query != '\0') {	    /* TODO: sanitize UTF8 */
78 			strlcat(b, "?", sizeof(b));
79 			strlcat(b, c->iri.query, sizeof(b));
80 		}
81 	} else {
82 		if ((t = c->req) == NULL)
83 			t = "";
84 		strlcpy(b, t, sizeof(b));
85 	}
86 
87 	if ((t = memchr(meta, '\r', l)) == NULL)
88 		t = meta + len;
89 
90 	fprintf(stderr, "%s:%s GET %s %.*s\n", hbuf, sbuf, b,
91 	    (int)(t-meta), meta);
92 }
93 
94 void
95 load_local_cert(struct vhost *h, const char *hostname, const char *dir)
96 {
97 	char *cert, *key;
98 
99 	if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
100 		fatal("asprintf");
101 	if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
102 		fatal("asprintf");
103 
104 	if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
105 		gen_certificate(hostname, cert, key);
106 
107 	h->cert = tls_load_file(cert, &h->certlen, NULL);
108 	if (h->cert == NULL)
109 		fatal("can't load %s", cert);
110 
111 	h->key = tls_load_file(key, &h->keylen, NULL);
112 	if (h->key == NULL)
113 		fatal("can't load %s", key);
114 
115 	strlcpy(h->domain, hostname, sizeof(h->domain));
116 }
117 
118 /* wrapper around dirname(3).  dn must be PATH_MAX+1 at least. */
119 static void
120 pdirname(const char *path, char *dn)
121 {
122 	char	 p[PATH_MAX+1];
123 	char	*t;
124 
125 	strlcpy(p, path, sizeof(p));
126 	t = dirname(p);
127 	memmove(dn, t, strlen(t)+1);
128 }
129 
130 static void
131 mkdirs(const char *path, mode_t mode)
132 {
133 	char	dname[PATH_MAX+1];
134 
135 	pdirname(path, dname);
136 	if (!strcmp(dname, "/"))
137 		return;
138 	mkdirs(dname, mode);
139 	if (mkdir(path, mode) != 0 && errno != EEXIST)
140 		fatal("can't mkdir %s", path);
141 }
142 
143 /* $XDG_DATA_HOME/gmid */
144 char *
145 data_dir(void)
146 {
147 	const char *home, *xdg;
148 	char *t;
149 
150 	if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
151 		if ((home = getenv("HOME")) == NULL)
152 			fatalx("XDG_DATA_HOME and HOME both empty");
153 		if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
154 			fatalx("asprintf");
155 	} else {
156 		if (asprintf(&t, "%s/gmid", xdg) == -1)
157 			fatal("asprintf");
158 	}
159 
160 	mkdirs(t, 0755);
161 	return t;
162 }
163 
164 static int
165 serve(const char *host, int port, const char *dir)
166 {
167 	struct addrinfo hints, *res, *res0;
168 	int r, error, saved_errno, sock = -1;
169 	const char *cause = NULL;
170 	char service[32];
171 
172 	r = snprintf(service, sizeof(service), "%d", port);
173 	if (r < 0 || (size_t)r >= sizeof(service))
174 		fatal("snprintf");
175 
176 	memset(&hints, 0, sizeof(hints));
177 	hints.ai_family = AF_UNSPEC;
178 	hints.ai_socktype = SOCK_STREAM;
179 	hints.ai_flags = AI_PASSIVE;
180 	error = getaddrinfo(host, service, &hints, &res0);
181 	if (error)
182 		fatalx("%s", gai_strerror(error));
183 	for (res = res0; res; res = res->ai_next) {
184 		sock = socket(res->ai_family, res->ai_socktype,
185 		    res->ai_protocol);
186 		if (sock == -1) {
187 			cause = "socket";
188 			continue;
189 		}
190 
191 		if (bind(sock, res->ai_addr, res->ai_addrlen) == -1) {
192 			cause = "bind";
193 			saved_errno = errno;
194 			close(sock);
195 			errno = saved_errno;
196 			continue;
197 		}
198 
199 		if (listen(sock, 5) == -1)
200 			fatal("listen");
201 
202 		/*
203 		 * for the time being, we're happy as soon as
204 		 * something binds.
205 		 */
206 		break;
207 	}
208 
209 	if (sock == -1)
210 		fatal("%s", cause);
211 	freeaddrinfo(res0);
212 
213 	event_init();
214 
215 	/* cheating */
216 	conf.sock4 = sock;
217 	event_set(&conf.evsock4, conf.sock4, EV_READ|EV_PERSIST,
218 	    do_accept, NULL);
219 
220 	server_init(NULL, NULL, NULL);
221 	if (server_configure_done(&conf) == -1)
222 		fatalx("server configuration failed");
223 
224 	log_info("serving %s on port %d", dir, port);
225 	event_dispatch();
226 	log_info("quitting");
227 	return 0;
228 }
229 
230 static __dead void
231 usage(void)
232 {
233 	fprintf(stderr,
234 	    "Version: " GE_STRING "\n"
235 	    "Usage: %s [-hVv] [-d certs-dir] [-H hostname] [-p port] [dir]\n",
236 	    getprogname());
237 	exit(1);
238 }
239 
240 int
241 main(int argc, char **argv)
242 {
243 	struct vhost *host;
244 	struct location *loc;
245 	const char *errstr, *certs_dir = NULL, *hostname = "localhost";
246 	char path[PATH_MAX];
247 	int ch;
248 
249 	setlocale(LC_CTYPE, "");
250 
251 	log_init(1, LOG_DAEMON);
252 	log_setverbose(0);
253 	config_init();
254 
255 	while ((ch = getopt_long(argc, argv, "d:H:hp:Vv", opts, NULL)) != -1) {
256 		switch (ch) {
257 		case 'd':
258 			certs_dir = optarg;
259 			break;
260 		case 'H':
261 			hostname = optarg;
262 			break;
263 		case 'h':
264 			usage();
265 			break;
266 		case 'p':
267 			conf.port = strtonum(optarg, 0, UINT16_MAX, &errstr);
268 			if (errstr)
269 				fatalx("port number is %s: %s", errstr,
270 				    optarg);
271 			break;
272 		case 'V':
273 			puts("Version: " GE_STRING);
274 			return 0;
275 		default:
276 			usage();
277 			break;
278 		}
279 	}
280 	argc -= optind;
281 	argv += optind;
282 
283 	if (argc > 1)
284 		usage();
285 
286 	/* prepare the configuration */
287 	init_mime(&conf.mime);
288 
289 	if (certs_dir == NULL)
290 		certs_dir = data_dir();
291 
292 	/* set up the implicit vhost and location */
293 	host = xcalloc(1, sizeof(*host));
294 	TAILQ_INSERT_HEAD(&hosts, host, vhosts);
295 
296 	loc = xcalloc(1, sizeof(*loc));
297 	loc->fcgi = -1;
298 	TAILQ_INSERT_HEAD(&host->locations, loc, locations);
299 
300 	load_local_cert(host, hostname, certs_dir);
301 
302 	strlcpy(host->domain, "*", sizeof(host->domain));
303 	loc->auto_index = 1;
304 	strlcpy(loc->match, "*", sizeof(loc->match));
305 
306 	if (*argv == NULL) {
307 		if (getcwd(path, sizeof(path)) == NULL)
308 			fatal("getcwd");
309 		strlcpy(loc->dir, path, sizeof(loc->dir));
310 	} else {
311 		char	*tmp;
312 
313 		tmp = absolutify_path(*argv);
314 		strlcpy(loc->dir, tmp, sizeof(loc->dir));
315 		free(tmp);
316 	}
317 
318 	/* start the server */
319 	signal(SIGPIPE, SIG_IGN);
320 	setproctitle("%s", loc->dir);
321 	return serve(hostname, conf.port, loc->dir);
322 }