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 488f059a 2020-12-24 op #include <poll.h>
 28 ca21e100 2021-02-04 op #include <signal.h>
 29 488f059a 2020-12-24 op #include <stdio.h>
 30 488f059a 2020-12-24 op #include <stdlib.h>
 31 488f059a 2020-12-24 op #include <syslog.h>
 32 488f059a 2020-12-24 op #include <tls.h>
 33 488f059a 2020-12-24 op #include <unistd.h>
 34 488f059a 2020-12-24 op 
 35 12042ad7 2021-01-21 op #include "config.h"
 36 12042ad7 2021-01-21 op 
 37 488f059a 2020-12-24 op #ifndef INFTIM
 38 488f059a 2020-12-24 op # define INFTIM -1
 39 488f059a 2020-12-24 op #endif
 40 488f059a 2020-12-24 op 
 41 488f059a 2020-12-24 op #define GEMINI_URL_LEN (1024+3)	/* URL max len + \r\n + \0 */
 42 488f059a 2020-12-24 op 
 43 488f059a 2020-12-24 op #define SUCCESS		20
 44 0be51733 2021-01-20 op #define TEMP_REDIRECT	30
 45 488f059a 2020-12-24 op #define TEMP_FAILURE	40
 46 35744950 2021-02-01 op #define CGI_ERROR	42
 47 488f059a 2020-12-24 op #define NOT_FOUND	51
 48 7b1d9790 2021-01-11 op #define PROXY_REFUSED	53
 49 488f059a 2020-12-24 op #define BAD_REQUEST	59
 50 488f059a 2020-12-24 op 
 51 488f059a 2020-12-24 op #define MAX_USERS	64
 52 488f059a 2020-12-24 op 
 53 15902770 2021-01-15 op #define HOSTSLEN	64
 54 c8b74339 2021-01-24 op #define LOCLEN		32
 55 15902770 2021-01-15 op 
 56 35cf19e3 2021-01-28 op /* maximum hostname and label length, +1 for the NUL-terminator */
 57 35cf19e3 2021-01-28 op #define DOMAIN_NAME_LEN	(253+1)
 58 35cf19e3 2021-01-28 op #define LABEL_LEN	(63+1)
 59 3300cbe0 2021-01-27 op 
 60 dafb57b8 2021-01-15 op #define LOGE(c, fmt, ...) logs(LOG_ERR,     c, fmt, __VA_ARGS__)
 61 dafb57b8 2021-01-15 op #define LOGW(c, fmt, ...) logs(LOG_WARNING, c, fmt, __VA_ARGS__)
 62 dafb57b8 2021-01-15 op #define LOGN(c, fmt, ...) logs(LOG_NOTICE,  c, fmt, __VA_ARGS__)
 63 dafb57b8 2021-01-15 op #define LOGI(c, fmt, ...) logs(LOG_INFO,    c, fmt, __VA_ARGS__)
 64 dafb57b8 2021-01-15 op #define LOGD(c, fmt, ...) logs(LOG_DEBUG,   c, fmt, __VA_ARGS__)
 65 dafb57b8 2021-01-15 op 
 66 c8b74339 2021-01-24 op struct location {
 67 fe5967cd 2021-01-27 op 	const char	*match;
 68 fe5967cd 2021-01-27 op 	const char	*lang;
 69 fe5967cd 2021-01-27 op 	const char	*default_mime;
 70 fe5967cd 2021-01-27 op 	const char	*index;
 71 252908e6 2021-01-24 op 	int		 auto_index; /* 0 auto, -1 off, 1 on */
 72 6abda252 2021-02-06 op 	int		 block_code;
 73 6abda252 2021-02-06 op 	const char	*block_fmt;
 74 6abda252 2021-02-06 op 	int		 strip;
 75 c8b74339 2021-01-24 op };
 76 c8b74339 2021-01-24 op 
 77 15902770 2021-01-15 op struct vhost {
 78 15902770 2021-01-15 op 	const char	*domain;
 79 15902770 2021-01-15 op 	const char	*cert;
 80 15902770 2021-01-15 op 	const char	*key;
 81 15902770 2021-01-15 op 	const char	*dir;
 82 15902770 2021-01-15 op 	const char	*cgi;
 83 e3ddf390 2021-02-06 op 	const char	*entrypoint;
 84 15902770 2021-01-15 op 	int		 dirfd;
 85 6016a593 2021-01-30 op 
 86 6016a593 2021-01-30 op 	/* the first location rule is always '*' and holds the default
 87 6016a593 2021-01-30 op 	 * settings for the vhost, from locations[1] onwards there are
 88 6016a593 2021-01-30 op 	 * the "real" location rules specified in the configuration. */
 89 c8b74339 2021-01-24 op 	struct location	 locations[LOCLEN];
 90 15902770 2021-01-15 op };
 91 15902770 2021-01-15 op 
 92 15902770 2021-01-15 op extern struct vhost hosts[HOSTSLEN];
 93 15902770 2021-01-15 op 
 94 a010b0dd 2021-01-18 op struct etm {			/* extension to mime */
 95 a010b0dd 2021-01-18 op 	const char	*mime;
 96 a010b0dd 2021-01-18 op 	const char	*ext;
 97 a010b0dd 2021-01-18 op };
 98 a010b0dd 2021-01-18 op 
 99 b2a6b613 2021-01-21 op struct mime {
100 a010b0dd 2021-01-18 op 	struct etm	*t;
101 a010b0dd 2021-01-18 op 	size_t		len;
102 a010b0dd 2021-01-18 op 	size_t		cap;
103 a010b0dd 2021-01-18 op };
104 a010b0dd 2021-01-18 op 
105 15902770 2021-01-15 op struct conf {
106 ae08ec7d 2021-01-25 op 	int		 port;
107 ae08ec7d 2021-01-25 op 	int		 ipv6;
108 ae08ec7d 2021-01-25 op 	uint32_t	 protos;
109 ae08ec7d 2021-01-25 op 	struct mime	 mime;
110 ae08ec7d 2021-01-25 op 	char		*chroot;
111 ae08ec7d 2021-01-25 op 	char		*user;
112 15902770 2021-01-15 op };
113 15902770 2021-01-15 op 
114 15902770 2021-01-15 op extern struct conf conf;
115 881a9dd9 2021-01-16 op extern int exfd;
116 15902770 2021-01-15 op 
117 ca21e100 2021-02-04 op extern volatile sig_atomic_t hupped;
118 ca21e100 2021-02-04 op 
119 0be51733 2021-01-20 op struct iri {
120 0be51733 2021-01-20 op 	char		*schema;
121 0be51733 2021-01-20 op 	char		*host;
122 0be51733 2021-01-20 op 	char		*port;
123 0be51733 2021-01-20 op 	uint16_t	 port_no;
124 0be51733 2021-01-20 op 	char		*path;
125 0be51733 2021-01-20 op 	char		*query;
126 0be51733 2021-01-20 op 	char		*fragment;
127 0be51733 2021-01-20 op };
128 0be51733 2021-01-20 op 
129 0be51733 2021-01-20 op struct parser {
130 0be51733 2021-01-20 op 	char		*iri;
131 0be51733 2021-01-20 op 	struct iri	*parsed;
132 0be51733 2021-01-20 op 	const char	*err;
133 0be51733 2021-01-20 op };
134 0be51733 2021-01-20 op 
135 112802ea 2021-02-01 op struct client;
136 488f059a 2020-12-24 op 
137 112802ea 2021-02-01 op typedef void (*statefn)(struct pollfd*, struct client*);
138 112802ea 2021-02-01 op 
139 92da8285 2021-02-01 op /*
140 92da8285 2021-02-01 op  * DFA: handle_handshake is the initial state, close_conn the final.
141 5f715ce4 2021-02-02 op  * Sometimes we have an enter_* function to handle the state switch.
142 92da8285 2021-02-01 op  *
143 92da8285 2021-02-01 op  * handle_handshake -> handle_open_conn
144 92da8285 2021-02-01 op  * handle_handshake -> close_conn		// on err
145 92da8285 2021-02-01 op  *
146 35744950 2021-02-01 op  * handle_open_conn -> handle_cgi_reply		// via open_file/dir/...
147 5f715ce4 2021-02-02 op  * handle_open_conn -> handle_dirlist		// ...same
148 92da8285 2021-02-01 op  * handle_open_conn -> send_file		// ...same
149 35744950 2021-02-01 op  * handle_open_conn -> start_reply		// on error
150 92da8285 2021-02-01 op  *
151 35744950 2021-02-01 op  * handle_cgi_reply -> handle_cgi	// after logging the CGI reply
152 35744950 2021-02-01 op  * handle_cgi_reply -> start_reply	// on error
153 35744950 2021-02-01 op  *
154 92da8285 2021-02-01 op  * handle_cgi -> close_conn
155 5f715ce4 2021-02-02 op  *
156 5f715ce4 2021-02-02 op  * handle_dirlist -> send_directory_listing
157 5f715ce4 2021-02-02 op  * handle_dirlist -> close_conn			// on error
158 92da8285 2021-02-01 op  *
159 92da8285 2021-02-01 op  * send_directory_listing -> close_conn
160 92da8285 2021-02-01 op  *
161 92da8285 2021-02-01 op  * send_file -> close_conn
162 92da8285 2021-02-01 op  */
163 488f059a 2020-12-24 op struct client {
164 488f059a 2020-12-24 op 	struct tls	*ctx;
165 0be51733 2021-01-20 op 	char		 req[GEMINI_URL_LEN];
166 0be51733 2021-01-20 op 	struct iri	 iri;
167 3300cbe0 2021-01-27 op 	char		 domain[DOMAIN_NAME_LEN];
168 112802ea 2021-02-01 op 	statefn		 state, next;
169 488f059a 2020-12-24 op 	int		 code;
170 488f059a 2020-12-24 op 	const char	*meta;
171 488f059a 2020-12-24 op 	int		 fd, waiting_on_child;
172 488f059a 2020-12-24 op 	char		 sbuf[1024];	  /* static buffer */
173 488f059a 2020-12-24 op 	void		*buf, *i;	  /* mmap buffer */
174 488f059a 2020-12-24 op 	ssize_t		 len, off;	  /* mmap/static buffer  */
175 252908e6 2021-01-24 op 	DIR		*dir;
176 709d6e5e 2021-01-10 op 	struct sockaddr_storage	 addr;
177 f7b816dc 2021-01-15 op 	struct vhost	*host;	/* host she's talking to */
178 488f059a 2020-12-24 op };
179 488f059a 2020-12-24 op 
180 488f059a 2020-12-24 op enum {
181 488f059a 2020-12-24 op 	FILE_EXISTS,
182 488f059a 2020-12-24 op 	FILE_EXECUTABLE,
183 488f059a 2020-12-24 op 	FILE_DIRECTORY,
184 488f059a 2020-12-24 op 	FILE_MISSING,
185 488f059a 2020-12-24 op };
186 488f059a 2020-12-24 op 
187 33d32d1f 2020-12-25 op /* gmid.c */
188 d3a08f4d 2021-01-17 op __attribute__((format (printf, 1, 2)))
189 d3a08f4d 2021-01-17 op __attribute__((__noreturn__))
190 d3a08f4d 2021-01-17 op void fatal(const char*, ...);
191 d3a08f4d 2021-01-17 op 
192 d3a08f4d 2021-01-17 op __attribute__((format (printf, 3, 4)))
193 d3a08f4d 2021-01-17 op void logs(int, struct client*, const char*, ...);
194 0be51733 2021-01-20 op void log_request(struct client*, char*, size_t);
195 d3a08f4d 2021-01-17 op 
196 4a28dd01 2020-12-28 op void		 sig_handler(int);
197 8443bff7 2021-01-25 op void		 gen_certificate(const char*, const char*, const char*);
198 8443bff7 2021-01-25 op void		 mkdirs(const char*);
199 8443bff7 2021-01-25 op char		*data_dir(void);
200 8443bff7 2021-01-25 op void		 load_local_cert(const char*, const char*);
201 ae08ec7d 2021-01-25 op void		 load_vhosts(void);
202 33ac26a0 2021-01-21 op int		 make_socket(int, int);
203 ae08ec7d 2021-01-25 op void		 setup_tls(void);
204 c8b74339 2021-01-24 op void		 init_config(void);
205 ca21e100 2021-02-04 op void		 free_config(void);
206 ae08ec7d 2021-01-25 op void		 drop_priv(void);
207 488f059a 2020-12-24 op void		 usage(const char*);
208 488f059a 2020-12-24 op 
209 f7b816dc 2021-01-15 op /* provided by lex/yacc */
210 15902770 2021-01-15 op extern FILE *yyin;
211 15902770 2021-01-15 op extern int yylineno;
212 15902770 2021-01-15 op extern int yyparse(void);
213 15902770 2021-01-15 op extern int yylex(void);
214 15902770 2021-01-15 op 
215 6abda252 2021-02-06 op void		 yyerror(const char*, ...);
216 13ed2fb6 2021-01-27 op int		 parse_portno(const char*);
217 13ed2fb6 2021-01-27 op void		 parse_conf(const char*);
218 13ed2fb6 2021-01-27 op 
219 0fbe79b3 2021-01-18 op /* mime.c */
220 b2a6b613 2021-01-21 op void		 init_mime(struct mime*);
221 b2a6b613 2021-01-21 op void		 add_mime(struct mime*, const char*, const char*);
222 b2a6b613 2021-01-21 op void		 load_default_mime(struct mime*);
223 6119e13e 2021-01-19 op const char	*mime(struct vhost*, const char*);
224 0fbe79b3 2021-01-18 op 
225 d3a08f4d 2021-01-17 op /* server.c */
226 c8b74339 2021-01-24 op const char	*vhost_lang(struct vhost*, const char*);
227 c8b74339 2021-01-24 op const char	*vhost_default_mime(struct vhost*, const char*);
228 c8b74339 2021-01-24 op const char	*vhost_index(struct vhost*, const char*);
229 252908e6 2021-01-24 op int		 vhost_auto_index(struct vhost*, const char*);
230 6abda252 2021-02-06 op int		 vhost_block_return(struct vhost*, const char*, int*, const char**);
231 6abda252 2021-02-06 op int		 vhost_strip(struct vhost*, const char*);
232 9b8f5ed2 2021-02-03 op void		 mark_nonblock(int);
233 d3a08f4d 2021-01-17 op void		 loop(struct tls*, int, int);
234 d3a08f4d 2021-01-17 op 
235 881a9dd9 2021-01-16 op /* ex.c */
236 881a9dd9 2021-01-16 op int		 send_string(int, const char*);
237 881a9dd9 2021-01-16 op int		 recv_string(int, char**);
238 2fafa2d2 2021-02-01 op int		 send_iri(int, struct iri*);
239 2fafa2d2 2021-02-01 op int		 recv_iri(int, struct iri*);
240 2fafa2d2 2021-02-01 op void		 free_recvd_iri(struct iri*);
241 881a9dd9 2021-01-16 op int		 send_vhost(int, struct vhost*);
242 881a9dd9 2021-01-16 op int		 recv_vhost(int, struct vhost**);
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 33d32d1f 2020-12-25 op 
259 3300cbe0 2021-01-27 op /* puny.c */
260 a2fd8013 2021-01-29 op int		 puny_decode(const char*, char*, size_t, const char**);
261 3300cbe0 2021-01-27 op 
262 44ee1bac 2021-01-27 op /* utils.c */
263 ca21e100 2021-02-04 op void		 block_signals(void);
264 ca21e100 2021-02-04 op void		 unblock_signals(void);
265 44ee1bac 2021-01-27 op int		 starts_with(const char*, const char*);
266 44ee1bac 2021-01-27 op int		 ends_with(const char*, const char*);
267 44ee1bac 2021-01-27 op ssize_t		 filesize(int);
268 2fafa2d2 2021-02-01 op char		*absolutify_path(const char*);
269 ca21e100 2021-02-04 op char		*xstrdup(const char*);
270 44ee1bac 2021-01-27 op 
271 488f059a 2020-12-24 op #endif