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 int privsep_process;
35 
36 static const struct option opts[] = {
37 	{"help",	no_argument,	NULL,	'h'},
38 	{"version",	no_argument,	NULL,	'V'},
39 	{NULL,		0,		NULL,	0},
40 };
41 
42 void
43 log_request(struct client *c, char *meta, size_t l)
44 {
45 	char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV], b[GEMINI_URL_LEN];
46 	const char *t;
47 	int ec;
48 
49 	ec = getnameinfo((struct sockaddr*)&c->raddr, c->raddrlen,
50 	    hbuf, sizeof(hbuf),
51 	    sbuf, sizeof(sbuf),
52 	    NI_NUMERICHOST | NI_NUMERICSERV);
53 	if (ec != 0)
54 		fatalx("getnameinfo: %s", gai_strerror(ec));
55 
56 	if (c->iri.schema != NULL) {
57 		/* serialize the IRI */
58 		strlcpy(b, c->iri.schema, sizeof(b));
59 		strlcat(b, "://", sizeof(b));
60 
61 		/* log the decoded host name, but if it was invalid
62 		 * use the raw one. */
63 		if (*c->domain != '\0')
64 			strlcat(b, c->domain, sizeof(b));
65 		else
66 			strlcat(b, c->iri.host, sizeof(b));
67 
68 		if (*c->iri.path != '/')
69 			strlcat(b, "/", sizeof(b));
70 		strlcat(b, c->iri.path, sizeof(b)); /* TODO: sanitize UTF8 */
71 		if (*c->iri.query != '\0') {	    /* TODO: sanitize UTF8 */
72 			strlcat(b, "?", sizeof(b));
73 			strlcat(b, c->iri.query, sizeof(b));
74 		}
75 	} else {
76 		if ((t = c->req) == NULL)
77 			t = "";
78 		strlcpy(b, t, sizeof(b));
79 	}
80 
81 	if ((t = memchr(meta, '\r', l)) == NULL)
82 		t = meta + l;
83 
84 	fprintf(stderr, "%s:%s GET %s %.*s\n", hbuf, sbuf, b,
85 	    (int)(t-meta), meta);
86 }
87 
88 void
89 load_local_cert(struct vhost *h, const char *hostname, const char *dir)
90 {
91 	char *cert, *key;
92 
93 	if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
94 		fatal("asprintf");
95 	if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
96 		fatal("asprintf");
97 
98 	if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
99 		gen_certificate(hostname, cert, key);
100 
101 	h->cert = tls_load_file(cert, &h->certlen, NULL);
102 	if (h->cert == NULL)
103 		fatal("can't load %s", cert);
104 
105 	h->key = tls_load_file(key, &h->keylen, NULL);
106 	if (h->key == NULL)
107 		fatal("can't load %s", key);
108 
109 	strlcpy(h->domain, hostname, sizeof(h->domain));
110 }
111 
112 /* wrapper around dirname(3).  dn must be PATH_MAX+1 at least. */
113 static void
114 pdirname(const char *path, char *dn)
115 {
116 	char	 p[PATH_MAX+1];
117 	char	*t;
118 
119 	strlcpy(p, path, sizeof(p));
120 	t = dirname(p);
121 	memmove(dn, t, strlen(t)+1);
122 }
123 
124 static void
125 mkdirs(const char *path, mode_t mode)
126 {
127 	char	dname[PATH_MAX+1];
128 
129 	pdirname(path, dname);
130 	if (!strcmp(dname, "/"))
131 		return;
132 	mkdirs(dname, mode);
133 	if (mkdir(path, mode) != 0 && errno != EEXIST)
134 		fatal("can't mkdir %s", path);
135 }
136 
137 /* $XDG_DATA_HOME/gmid */
138 char *
139 data_dir(void)
140 {
141 	const char *home, *xdg;
142 	char *t;
143 
144 	if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
145 		if ((home = getenv("HOME")) == NULL)
146 			fatalx("XDG_DATA_HOME and HOME both empty");
147 		if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
148 			fatalx("asprintf");
149 	} else {
150 		if (asprintf(&t, "%s/gmid", xdg) == -1)
151 			fatal("asprintf");
152 	}
153 
154 	mkdirs(t, 0755);
155 	return t;
156 }
157 
158 static int
159 serve(struct conf *conf, const char *host, int port, const char *dir)
160 {
161 	struct addrinfo hints, *res, *res0;
162 	struct vhost *vh = TAILQ_FIRST(&conf->hosts);
163 	struct address *addr, *acp;
164 	int r, error, saved_errno, sock = -1;
165 	const char *cause = NULL;
166 	char service[32];
167 	int any = 0;
168 
169 	event_init();
170 
171 	r = snprintf(service, sizeof(service), "%d", port);
172 	if (r < 0 || (size_t)r >= sizeof(service))
173 		fatal("snprintf");
174 
175 	memset(&hints, 0, sizeof(hints));
176 	hints.ai_family = AF_UNSPEC;
177 	hints.ai_socktype = SOCK_STREAM;
178 	hints.ai_flags = AI_PASSIVE;
179 	error = getaddrinfo(host, service, &hints, &res0);
180 	if (error)
181 		fatalx("%s", gai_strerror(error));
182 	for (res = res0; res; res = res->ai_next) {
183 		sock = socket(res->ai_family, res->ai_socktype,
184 		    res->ai_protocol);
185 		if (sock == -1) {
186 			cause = "socket";
187 			continue;
188 		}
189 
190 		if (bind(sock, res->ai_addr, res->ai_addrlen) == -1) {
191 			cause = "bind";
192 			saved_errno = errno;
193 			close(sock);
194 			errno = saved_errno;
195 			continue;
196 		}
197 
198 		if (listen(sock, 5) == -1)
199 			fatal("listen");
200 
201 		any = 1;
202 
203 		addr = xcalloc(1, sizeof(*addr));
204 		addr->ai_flags = res->ai_flags;
205 		addr->ai_family = res->ai_family;
206 		addr->ai_socktype = res->ai_socktype;
207 		addr->ai_protocol = res->ai_protocol;
208 		addr->slen = res->ai_addrlen;
209 		memcpy(&addr->ss, res->ai_addr, res->ai_addrlen);
210 
211 		addr->conf = conf;
212 		addr->sock = sock;
213 		event_set(&addr->evsock, addr->sock, EV_READ|EV_PERSIST,
214 		    do_accept, addr);
215 
216 		TAILQ_INSERT_HEAD(&conf->addrs, addr, addrs);
217 
218 		acp = xcalloc(1, sizeof(*acp));
219 		memcpy(acp, addr, sizeof(*acp));
220 		acp->sock = -1;
221 		memset(&acp->evsock, 0, sizeof(acp->evsock));
222 		TAILQ_INSERT_HEAD(&vh->addrs, addr, addrs);
223 	}
224 
225 	if (!any)
226 		fatal("%s", cause);
227 	freeaddrinfo(res0);
228 
229 	server_init(NULL, NULL, NULL);
230 	if (server_configure_done(conf) == -1)
231 		fatalx("server configuration failed");
232 
233 	log_info("serving %s on port %d", dir, port);
234 	event_dispatch();
235 	log_info("quitting");
236 	return 0;
237 }
238 
239 static __dead void
240 usage(void)
241 {
242 	fprintf(stderr,
243 	    "Version: " GE_STRING "\n"
244 	    "Usage: %s [-hVv] [-d certs-dir] [-H hostname] [-p port] [dir]\n",
245 	    getprogname());
246 	exit(1);
247 }
248 
249 int
250 main(int argc, char **argv)
251 {
252 	struct conf *conf;
253 	struct vhost *host;
254 	struct location *loc;
255 	const char *errstr, *certs_dir = NULL, *hostname = "localhost";
256 	char path[PATH_MAX];
257 	int ch, port = 1965;
258 
259 	setlocale(LC_CTYPE, "");
260 
261 	log_init(1, LOG_DAEMON);
262 	log_setverbose(0);
263 	conf = config_new();
264 
265 	/* ge doesn't do privsep so no privsep crypto engine. */
266 	conf->use_privsep_crypto = 0;
267 
268 	while ((ch = getopt_long(argc, argv, "d:H:hp:Vv", opts, NULL)) != -1) {
269 		switch (ch) {
270 		case 'd':
271 			certs_dir = optarg;
272 			break;
273 		case 'H':
274 			hostname = optarg;
275 			break;
276 		case 'h':
277 			usage();
278 			break;
279 		case 'p':
280 			port = strtonum(optarg, 0, UINT16_MAX, &errstr);
281 			if (errstr)
282 				fatalx("port number is %s: %s", errstr,
283 				    optarg);
284 			break;
285 		case 'V':
286 			puts("Version: " GE_STRING);
287 			return 0;
288 		default:
289 			usage();
290 			break;
291 		}
292 	}
293 	argc -= optind;
294 	argv += optind;
295 
296 	if (argc > 1)
297 		usage();
298 
299 	/* prepare the configuration */
300 	init_mime(&conf->mime);
301 
302 	if (certs_dir == NULL)
303 		certs_dir = data_dir();
304 
305 	/* set up the implicit vhost and location */
306 	host = xcalloc(1, sizeof(*host));
307 	TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
308 
309 	loc = xcalloc(1, sizeof(*loc));
310 	loc->fcgi = -1;
311 	TAILQ_INSERT_HEAD(&host->locations, loc, locations);
312 
313 	load_local_cert(host, hostname, certs_dir);
314 
315 	strlcpy(host->domain, "*", sizeof(host->domain));
316 	loc->auto_index = 1;
317 	strlcpy(loc->match, "*", sizeof(loc->match));
318 
319 	if (*argv == NULL) {
320 		if (getcwd(path, sizeof(path)) == NULL)
321 			fatal("getcwd");
322 		strlcpy(loc->dir, path, sizeof(loc->dir));
323 	} else {
324 		char	*tmp;
325 
326 		tmp = absolutify_path(*argv);
327 		strlcpy(loc->dir, tmp, sizeof(loc->dir));
328 		free(tmp);
329 	}
330 
331 	/* start the server */
332 	signal(SIGPIPE, SIG_IGN);
333 	setproctitle("%s", loc->dir);
334 	return serve(conf, hostname, port, loc->dir);
335 }