1 d5aba4c7 2020-12-24 op /*
  2 d5aba4c7 2020-12-24 op  * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
  3 d5aba4c7 2020-12-24 op  *
  4 d5aba4c7 2020-12-24 op  * Permission to use, copy, modify, and distribute this software for any
  5 d5aba4c7 2020-12-24 op  * purpose with or without fee is hereby granted, provided that the above
  6 d5aba4c7 2020-12-24 op  * copyright notice and this permission notice appear in all copies.
  7 d5aba4c7 2020-12-24 op  *
  8 d5aba4c7 2020-12-24 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 d5aba4c7 2020-12-24 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 d5aba4c7 2020-12-24 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 d5aba4c7 2020-12-24 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 d5aba4c7 2020-12-24 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 d5aba4c7 2020-12-24 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 d5aba4c7 2020-12-24 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 d5aba4c7 2020-12-24 op  */
 16 d5aba4c7 2020-12-24 op 
 17 488f059a 2020-12-24 op #ifndef GMID_H
 18 488f059a 2020-12-24 op #define GMID_H
 19 488f059a 2020-12-24 op 
 20 252908e6 2021-01-24 op #include <sys/socket.h>
 21 252908e6 2021-01-24 op #include <sys/types.h>
 22 252908e6 2021-01-24 op 
 23 488f059a 2020-12-24 op #include <arpa/inet.h>
 24 488f059a 2020-12-24 op #include <netinet/in.h>
 25 488f059a 2020-12-24 op 
 26 252908e6 2021-01-24 op #include <dirent.h>
 27 ca21e100 2021-02-04 op #include <signal.h>
 28 488f059a 2020-12-24 op #include <stdio.h>
 29 488f059a 2020-12-24 op #include <stdlib.h>
 30 b63e30ff 2021-02-07 op #include <time.h>
 31 488f059a 2020-12-24 op #include <tls.h>
 32 488f059a 2020-12-24 op #include <unistd.h>
 33 488f059a 2020-12-24 op 
 34 12042ad7 2021-01-21 op #include "config.h"
 35 12042ad7 2021-01-21 op 
 36 488f059a 2020-12-24 op #define GEMINI_URL_LEN (1024+3)	/* URL max len + \r\n + \0 */
 37 488f059a 2020-12-24 op 
 38 488f059a 2020-12-24 op #define SUCCESS		20
 39 0be51733 2021-01-20 op #define TEMP_REDIRECT	30
 40 488f059a 2020-12-24 op #define TEMP_FAILURE	40
 41 35744950 2021-02-01 op #define CGI_ERROR	42
 42 488f059a 2020-12-24 op #define NOT_FOUND	51
 43 7b1d9790 2021-01-11 op #define PROXY_REFUSED	53
 44 488f059a 2020-12-24 op #define BAD_REQUEST	59
 45 488f059a 2020-12-24 op 
 46 488f059a 2020-12-24 op #define MAX_USERS	64
 47 488f059a 2020-12-24 op 
 48 15902770 2021-01-15 op #define HOSTSLEN	64
 49 c8b74339 2021-01-24 op #define LOCLEN		32
 50 15902770 2021-01-15 op 
 51 35cf19e3 2021-01-28 op /* maximum hostname and label length, +1 for the NUL-terminator */
 52 35cf19e3 2021-01-28 op #define DOMAIN_NAME_LEN	(253+1)
 53 35cf19e3 2021-01-28 op #define LABEL_LEN	(63+1)
 54 3300cbe0 2021-01-27 op 
 55 c8b74339 2021-01-24 op struct location {
 56 fe5967cd 2021-01-27 op 	const char	*match;
 57 fe5967cd 2021-01-27 op 	const char	*lang;
 58 fe5967cd 2021-01-27 op 	const char	*default_mime;
 59 fe5967cd 2021-01-27 op 	const char	*index;
 60 252908e6 2021-01-24 op 	int		 auto_index; /* 0 auto, -1 off, 1 on */
 61 6abda252 2021-02-06 op 	int		 block_code;
 62 6abda252 2021-02-06 op 	const char	*block_fmt;
 63 6abda252 2021-02-06 op 	int		 strip;
 64 c8b74339 2021-01-24 op };
 65 c8b74339 2021-01-24 op 
 66 15902770 2021-01-15 op struct vhost {
 67 15902770 2021-01-15 op 	const char	*domain;
 68 15902770 2021-01-15 op 	const char	*cert;
 69 15902770 2021-01-15 op 	const char	*key;
 70 15902770 2021-01-15 op 	const char	*dir;
 71 15902770 2021-01-15 op 	const char	*cgi;
 72 e3ddf390 2021-02-06 op 	const char	*entrypoint;
 73 15902770 2021-01-15 op 	int		 dirfd;
 74 6016a593 2021-01-30 op 
 75 6016a593 2021-01-30 op 	/* the first location rule is always '*' and holds the default
 76 6016a593 2021-01-30 op 	 * settings for the vhost, from locations[1] onwards there are
 77 6016a593 2021-01-30 op 	 * the "real" location rules specified in the configuration. */
 78 c8b74339 2021-01-24 op 	struct location	 locations[LOCLEN];
 79 15902770 2021-01-15 op };
 80 15902770 2021-01-15 op 
 81 15902770 2021-01-15 op extern struct vhost hosts[HOSTSLEN];
 82 15902770 2021-01-15 op 
 83 a010b0dd 2021-01-18 op struct etm {			/* extension to mime */
 84 a010b0dd 2021-01-18 op 	const char	*mime;
 85 a010b0dd 2021-01-18 op 	const char	*ext;
 86 a010b0dd 2021-01-18 op };
 87 a010b0dd 2021-01-18 op 
 88 b2a6b613 2021-01-21 op struct mime {
 89 a010b0dd 2021-01-18 op 	struct etm	*t;
 90 a010b0dd 2021-01-18 op 	size_t		len;
 91 a010b0dd 2021-01-18 op 	size_t		cap;
 92 a010b0dd 2021-01-18 op };
 93 a010b0dd 2021-01-18 op 
 94 15902770 2021-01-15 op struct conf {
 95 3abf91b0 2021-02-07 op 	/* from command line */
 96 3abf91b0 2021-02-07 op 	int		 foreground;
 97 3abf91b0 2021-02-07 op 	int		 verbose;
 98 3abf91b0 2021-02-07 op 
 99 3abf91b0 2021-02-07 op 	/* in the config */
100 ae08ec7d 2021-01-25 op 	int		 port;
101 ae08ec7d 2021-01-25 op 	int		 ipv6;
102 ae08ec7d 2021-01-25 op 	uint32_t	 protos;
103 ae08ec7d 2021-01-25 op 	struct mime	 mime;
104 ae08ec7d 2021-01-25 op 	char		*chroot;
105 ae08ec7d 2021-01-25 op 	char		*user;
106 a709ddf5 2021-02-07 op 	int		 prefork;
107 15902770 2021-01-15 op };
108 15902770 2021-01-15 op 
109 15902770 2021-01-15 op extern struct conf conf;
110 881a9dd9 2021-01-16 op extern int exfd;
111 15902770 2021-01-15 op 
112 ca21e100 2021-02-04 op extern volatile sig_atomic_t hupped;
113 ca21e100 2021-02-04 op 
114 0be51733 2021-01-20 op struct iri {
115 0be51733 2021-01-20 op 	char		*schema;
116 0be51733 2021-01-20 op 	char		*host;
117 0be51733 2021-01-20 op 	char		*port;
118 0be51733 2021-01-20 op 	uint16_t	 port_no;
119 0be51733 2021-01-20 op 	char		*path;
120 0be51733 2021-01-20 op 	char		*query;
121 0be51733 2021-01-20 op 	char		*fragment;
122 0be51733 2021-01-20 op };
123 0be51733 2021-01-20 op 
124 0be51733 2021-01-20 op struct parser {
125 0be51733 2021-01-20 op 	char		*iri;
126 0be51733 2021-01-20 op 	struct iri	*parsed;
127 0be51733 2021-01-20 op 	const char	*err;
128 0be51733 2021-01-20 op };
129 0be51733 2021-01-20 op 
130 112802ea 2021-02-01 op struct client;
131 488f059a 2020-12-24 op 
132 abc007d2 2021-02-08 op typedef void (*statefn)(int, short, void*);
133 112802ea 2021-02-01 op 
134 92da8285 2021-02-01 op /*
135 92da8285 2021-02-01 op  * DFA: handle_handshake is the initial state, close_conn the final.
136 5f715ce4 2021-02-02 op  * Sometimes we have an enter_* function to handle the state switch.
137 92da8285 2021-02-01 op  *
138 92da8285 2021-02-01 op  * handle_handshake -> handle_open_conn
139 92da8285 2021-02-01 op  * handle_handshake -> close_conn		// on err
140 92da8285 2021-02-01 op  *
141 35744950 2021-02-01 op  * handle_open_conn -> handle_cgi_reply		// via open_file/dir/...
142 5f715ce4 2021-02-02 op  * handle_open_conn -> handle_dirlist		// ...same
143 92da8285 2021-02-01 op  * handle_open_conn -> send_file		// ...same
144 35744950 2021-02-01 op  * handle_open_conn -> start_reply		// on error
145 92da8285 2021-02-01 op  *
146 35744950 2021-02-01 op  * handle_cgi_reply -> handle_cgi	// after logging the CGI reply
147 35744950 2021-02-01 op  * handle_cgi_reply -> start_reply	// on error
148 35744950 2021-02-01 op  *
149 92da8285 2021-02-01 op  * handle_cgi -> close_conn
150 5f715ce4 2021-02-02 op  *
151 5f715ce4 2021-02-02 op  * handle_dirlist -> send_directory_listing
152 5f715ce4 2021-02-02 op  * handle_dirlist -> close_conn			// on error
153 92da8285 2021-02-01 op  *
154 92da8285 2021-02-01 op  * send_directory_listing -> close_conn
155 92da8285 2021-02-01 op  *
156 92da8285 2021-02-01 op  * send_file -> close_conn
157 92da8285 2021-02-01 op  */
158 488f059a 2020-12-24 op struct client {
159 488f059a 2020-12-24 op 	struct tls	*ctx;
160 0be51733 2021-01-20 op 	char		 req[GEMINI_URL_LEN];
161 0be51733 2021-01-20 op 	struct iri	 iri;
162 3300cbe0 2021-01-27 op 	char		 domain[DOMAIN_NAME_LEN];
163 abc007d2 2021-02-08 op 	statefn		 next;
164 488f059a 2020-12-24 op 	int		 code;
165 488f059a 2020-12-24 op 	const char	*meta;
166 abc007d2 2021-02-08 op 	int		 fd, pfd;
167 abc007d2 2021-02-08 op 	DIR		*dir;
168 488f059a 2020-12-24 op 	char		 sbuf[1024];	  /* static buffer */
169 488f059a 2020-12-24 op 	void		*buf, *i;	  /* mmap buffer */
170 488f059a 2020-12-24 op 	ssize_t		 len, off;	  /* mmap/static buffer  */
171 709d6e5e 2021-01-10 op 	struct sockaddr_storage	 addr;
172 f7b816dc 2021-01-15 op 	struct vhost	*host;	/* host she's talking to */
173 488f059a 2020-12-24 op };
174 488f059a 2020-12-24 op 
175 488f059a 2020-12-24 op enum {
176 488f059a 2020-12-24 op 	FILE_EXISTS,
177 488f059a 2020-12-24 op 	FILE_EXECUTABLE,
178 488f059a 2020-12-24 op 	FILE_DIRECTORY,
179 488f059a 2020-12-24 op 	FILE_MISSING,
180 488f059a 2020-12-24 op };
181 488f059a 2020-12-24 op 
182 33d32d1f 2020-12-25 op /* gmid.c */
183 4a28dd01 2020-12-28 op void		 sig_handler(int);
184 8443bff7 2021-01-25 op void		 mkdirs(const char*);
185 8443bff7 2021-01-25 op char		*data_dir(void);
186 8443bff7 2021-01-25 op void		 load_local_cert(const char*, const char*);
187 ae08ec7d 2021-01-25 op void		 load_vhosts(void);
188 33ac26a0 2021-01-21 op int		 make_socket(int, int);
189 ae08ec7d 2021-01-25 op void		 setup_tls(void);
190 c8b74339 2021-01-24 op void		 init_config(void);
191 ca21e100 2021-02-04 op void		 free_config(void);
192 ae08ec7d 2021-01-25 op void		 drop_priv(void);
193 488f059a 2020-12-24 op 
194 f7b816dc 2021-01-15 op /* provided by lex/yacc */
195 15902770 2021-01-15 op extern FILE *yyin;
196 15902770 2021-01-15 op extern int yylineno;
197 15902770 2021-01-15 op extern int yyparse(void);
198 15902770 2021-01-15 op extern int yylex(void);
199 15902770 2021-01-15 op 
200 6abda252 2021-02-06 op void		 yyerror(const char*, ...);
201 13ed2fb6 2021-01-27 op int		 parse_portno(const char*);
202 13ed2fb6 2021-01-27 op void		 parse_conf(const char*);
203 13ed2fb6 2021-01-27 op 
204 3abf91b0 2021-02-07 op /* log.c */
205 3abf91b0 2021-02-07 op void		 fatal(const char*, ...)
206 3abf91b0 2021-02-07 op 	__attribute__((format (printf, 1, 2)))
207 3abf91b0 2021-02-07 op 	__attribute__((__noreturn__));
208 3abf91b0 2021-02-07 op 
209 3abf91b0 2021-02-07 op #define LOG_ATTR_FMT __attribute__((format (printf, 2, 3)))
210 3abf91b0 2021-02-07 op void		 log_err(struct client*, const char*, ...)	LOG_ATTR_FMT;
211 3abf91b0 2021-02-07 op void		 log_warn(struct client*, const char*, ...)	LOG_ATTR_FMT;
212 3abf91b0 2021-02-07 op void		 log_notice(struct client*, const char*, ...)	LOG_ATTR_FMT;
213 3abf91b0 2021-02-07 op void		 log_info(struct client*, const char*, ...)	LOG_ATTR_FMT;
214 3abf91b0 2021-02-07 op void		 log_debug(struct client*, const char*, ...)	LOG_ATTR_FMT;
215 3abf91b0 2021-02-07 op void		 log_request(struct client*, char*, size_t);
216 3abf91b0 2021-02-07 op 
217 0fbe79b3 2021-01-18 op /* mime.c */
218 b2a6b613 2021-01-21 op void		 init_mime(struct mime*);
219 b2a6b613 2021-01-21 op void		 add_mime(struct mime*, const char*, const char*);
220 b2a6b613 2021-01-21 op void		 load_default_mime(struct mime*);
221 6119e13e 2021-01-19 op const char	*mime(struct vhost*, const char*);
222 0fbe79b3 2021-01-18 op 
223 d3a08f4d 2021-01-17 op /* server.c */
224 c8b74339 2021-01-24 op const char	*vhost_lang(struct vhost*, const char*);
225 c8b74339 2021-01-24 op const char	*vhost_default_mime(struct vhost*, const char*);
226 c8b74339 2021-01-24 op const char	*vhost_index(struct vhost*, const char*);
227 252908e6 2021-01-24 op int		 vhost_auto_index(struct vhost*, const char*);
228 6abda252 2021-02-06 op int		 vhost_block_return(struct vhost*, const char*, int*, const char**);
229 6abda252 2021-02-06 op int		 vhost_strip(struct vhost*, const char*);
230 9b8f5ed2 2021-02-03 op void		 mark_nonblock(int);
231 d3a08f4d 2021-01-17 op void		 loop(struct tls*, int, int);
232 d3a08f4d 2021-01-17 op 
233 881a9dd9 2021-01-16 op /* ex.c */
234 881a9dd9 2021-01-16 op int		 send_string(int, const char*);
235 881a9dd9 2021-01-16 op int		 recv_string(int, char**);
236 2fafa2d2 2021-02-01 op int		 send_iri(int, struct iri*);
237 2fafa2d2 2021-02-01 op int		 recv_iri(int, struct iri*);
238 2fafa2d2 2021-02-01 op void		 free_recvd_iri(struct iri*);
239 881a9dd9 2021-01-16 op int		 send_vhost(int, struct vhost*);
240 881a9dd9 2021-01-16 op int		 recv_vhost(int, struct vhost**);
241 b63e30ff 2021-02-07 op int		 send_time(int, time_t);
242 b63e30ff 2021-02-07 op int		 recv_time(int, time_t*);
243 881a9dd9 2021-01-16 op int		 send_fd(int, int);
244 881a9dd9 2021-01-16 op int		 recv_fd(int);
245 4e2e2ab1 2021-02-03 op int		 executor_main(void);
246 881a9dd9 2021-01-16 op 
247 dafb57b8 2021-01-15 op /* sandbox.c */
248 33ac26a0 2021-01-21 op void		 sandbox(void);
249 dafb57b8 2021-01-15 op 
250 ef04b551 2021-01-09 op /* utf8.c */
251 ef04b551 2021-01-09 op int		 valid_multibyte_utf8(struct parser*);
252 3300cbe0 2021-01-27 op char		*utf8_nth(char*, size_t);
253 ef04b551 2021-01-09 op 
254 3c1cf9d0 2021-01-11 op /* iri.c */
255 3c1cf9d0 2021-01-11 op int		 parse_iri(char*, struct iri*, const char**);
256 c4f682f8 2021-01-27 op int		 trim_req_iri(char*, const char **);
257 2fafa2d2 2021-02-01 op int		 serialize_iri(struct iri*, char*, size_t);
258 9f006a21 2021-02-07 op char		*pct_decode_str(char *);
259 33d32d1f 2020-12-25 op 
260 3300cbe0 2021-01-27 op /* puny.c */
261 a2fd8013 2021-01-29 op int		 puny_decode(const char*, char*, size_t, const char**);
262 3300cbe0 2021-01-27 op 
263 44ee1bac 2021-01-27 op /* utils.c */
264 ca21e100 2021-02-04 op void		 block_signals(void);
265 ca21e100 2021-02-04 op void		 unblock_signals(void);
266 44ee1bac 2021-01-27 op int		 starts_with(const char*, const char*);
267 44ee1bac 2021-01-27 op int		 ends_with(const char*, const char*);
268 44ee1bac 2021-01-27 op ssize_t		 filesize(int);
269 2fafa2d2 2021-02-01 op char		*absolutify_path(const char*);
270 ca21e100 2021-02-04 op char		*xstrdup(const char*);
271 3abf91b0 2021-02-07 op void		 gen_certificate(const char*, const char*, const char*);
272 44ee1bac 2021-01-27 op 
273 488f059a 2020-12-24 op #endif