2 * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
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.
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.
20 #include <sys/socket.h>
21 #include <sys/types.h>
23 #include <arpa/inet.h>
24 #include <netinet/in.h>
40 #define GEMINI_URL_LEN (1024+3) /* URL max len + \r\n + \0 */
43 #define TEMP_REDIRECT 30
44 #define TEMP_FAILURE 40
47 #define PROXY_REFUSED 53
48 #define BAD_REQUEST 59
55 /* maximum hostname and label length, +1 for the NUL-terminator */
56 #define DOMAIN_NAME_LEN (253+1)
57 #define LABEL_LEN (63+1)
59 #define LOGE(c, fmt, ...) logs(LOG_ERR, c, fmt, __VA_ARGS__)
60 #define LOGW(c, fmt, ...) logs(LOG_WARNING, c, fmt, __VA_ARGS__)
61 #define LOGN(c, fmt, ...) logs(LOG_NOTICE, c, fmt, __VA_ARGS__)
62 #define LOGI(c, fmt, ...) logs(LOG_INFO, c, fmt, __VA_ARGS__)
63 #define LOGD(c, fmt, ...) logs(LOG_DEBUG, c, fmt, __VA_ARGS__)
68 const char *default_mime;
70 int auto_index; /* 0 auto, -1 off, 1 on */
81 /* the first location rule is always '*' and holds the default
82 * settings for the vhost, from locations[1] onwards there are
83 * the "real" location rules specified in the configuration. */
84 struct location locations[LOCLEN];
87 extern struct vhost hosts[HOSTSLEN];
89 struct etm { /* extension to mime */
109 extern struct conf conf;
130 typedef void (*statefn)(struct pollfd*, struct client*);
133 * DFA: handle_handshake is the initial state, close_conn the final.
134 * Sometimes we have an enter_* function to handle the state switch.
136 * handle_handshake -> handle_open_conn
137 * handle_handshake -> close_conn // on err
139 * handle_open_conn -> handle_cgi_reply // via open_file/dir/...
140 * handle_open_conn -> handle_dirlist // ...same
141 * handle_open_conn -> send_file // ...same
142 * handle_open_conn -> start_reply // on error
144 * handle_cgi_reply -> handle_cgi // after logging the CGI reply
145 * handle_cgi_reply -> start_reply // on error
147 * handle_cgi -> close_conn
149 * handle_dirlist -> send_directory_listing
150 * handle_dirlist -> close_conn // on error
152 * send_directory_listing -> close_conn
154 * send_file -> close_conn
158 char req[GEMINI_URL_LEN];
160 char domain[DOMAIN_NAME_LEN];
164 int fd, waiting_on_child;
165 char sbuf[1024]; /* static buffer */
166 void *buf, *i; /* mmap buffer */
167 ssize_t len, off; /* mmap/static buffer */
169 struct sockaddr_storage addr;
170 struct vhost *host; /* host she's talking to */
181 __attribute__((format (printf, 1, 2)))
182 __attribute__((__noreturn__))
183 void fatal(const char*, ...);
185 __attribute__((format (printf, 3, 4)))
186 void logs(int, struct client*, const char*, ...);
187 void log_request(struct client*, char*, size_t);
189 void sig_handler(int);
190 void gen_certificate(const char*, const char*, const char*);
191 void mkdirs(const char*);
192 char *data_dir(void);
193 void load_local_cert(const char*, const char*);
194 void load_vhosts(void);
195 int make_socket(int, int);
196 void setup_tls(void);
197 int listener_main(void);
198 void init_config(void);
199 void drop_priv(void);
200 void usage(const char*);
202 /* provided by lex/yacc */
205 extern int yyparse(void);
206 extern int yylex(void);
208 void yyerror(const char*);
209 int parse_portno(const char*);
210 void parse_conf(const char*);
213 void init_mime(struct mime*);
214 void add_mime(struct mime*, const char*, const char*);
215 void load_default_mime(struct mime*);
216 const char *mime(struct vhost*, const char*);
219 const char *vhost_lang(struct vhost*, const char*);
220 const char *vhost_default_mime(struct vhost*, const char*);
221 const char *vhost_index(struct vhost*, const char*);
222 int vhost_auto_index(struct vhost*, const char*);
223 int check_path(struct client*, const char*, int*);
224 void open_file(struct pollfd*, struct client*);
225 void load_file(struct pollfd*, struct client*);
226 void check_for_cgi(struct pollfd*, struct client*);
227 void mark_nonblock(int);
228 void handle_handshake(struct pollfd*, struct client*);
229 void handle_open_conn(struct pollfd*, struct client*);
230 void start_reply(struct pollfd*, struct client*, int, const char*);
231 void handle_start_reply(struct pollfd*, struct client*);
232 void start_cgi(const char*, const char*, struct pollfd*, struct client*);
233 void send_file(struct pollfd*, struct client*);
234 void open_dir(struct pollfd*, struct client*);
235 void redirect_canonical_dir(struct pollfd*, struct client*);
236 void enter_handle_dirlist(struct pollfd*, struct client*);
237 void handle_dirlist(struct pollfd*, struct client*);
238 int read_next_dir_entry(struct client*);
239 void send_directory_listing(struct pollfd*, struct client*);
240 void cgi_poll_on_child(struct pollfd*, struct client*);
241 void cgi_poll_on_client(struct pollfd*, struct client*);
242 void handle_cgi_reply(struct pollfd*, struct client*);
243 void handle_cgi(struct pollfd*, struct client*);
244 void close_conn(struct pollfd*, struct client*);
245 void do_accept(int, struct tls*, struct pollfd*, struct client*);
246 void loop(struct tls*, int, int);
249 int send_string(int, const char*);
250 int recv_string(int, char**);
251 int send_iri(int, struct iri*);
252 int recv_iri(int, struct iri*);
253 void free_recvd_iri(struct iri*);
254 int send_vhost(int, struct vhost*);
255 int recv_vhost(int, struct vhost**);
256 int send_fd(int, int);
258 int executor_main(int);
264 int valid_multibyte_utf8(struct parser*);
265 char *utf8_nth(char*, size_t);
268 int parse_iri(char*, struct iri*, const char**);
269 int trim_req_iri(char*, const char **);
270 int serialize_iri(struct iri*, char*, size_t);
273 int puny_decode(const char*, char*, size_t, const char**);
276 int starts_with(const char*, const char*);
277 int ends_with(const char*, const char*);
278 ssize_t filesize(int);
279 char *absolutify_path(const char*);