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 488f059a 2020-12-24 op #include <stdio.h>
 29 488f059a 2020-12-24 op #include <stdlib.h>
 30 488f059a 2020-12-24 op #include <syslog.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 #ifndef INFTIM
 37 488f059a 2020-12-24 op # define INFTIM -1
 38 488f059a 2020-12-24 op #endif
 39 488f059a 2020-12-24 op 
 40 488f059a 2020-12-24 op #define GEMINI_URL_LEN (1024+3)	/* URL max len + \r\n + \0 */
 41 488f059a 2020-12-24 op 
 42 488f059a 2020-12-24 op #define SUCCESS		20
 43 0be51733 2021-01-20 op #define TEMP_REDIRECT	30
 44 488f059a 2020-12-24 op #define TEMP_FAILURE	40
 45 488f059a 2020-12-24 op #define NOT_FOUND	51
 46 7b1d9790 2021-01-11 op #define PROXY_REFUSED	53
 47 488f059a 2020-12-24 op #define BAD_REQUEST	59
 48 488f059a 2020-12-24 op 
 49 488f059a 2020-12-24 op #define MAX_USERS	64
 50 488f059a 2020-12-24 op 
 51 15902770 2021-01-15 op #define HOSTSLEN	64
 52 c8b74339 2021-01-24 op #define LOCLEN		32
 53 15902770 2021-01-15 op 
 54 35cf19e3 2021-01-28 op /* maximum hostname and label length, +1 for the NUL-terminator */
 55 35cf19e3 2021-01-28 op #define DOMAIN_NAME_LEN	(253+1)
 56 35cf19e3 2021-01-28 op #define LABEL_LEN	(63+1)
 57 3300cbe0 2021-01-27 op 
 58 dafb57b8 2021-01-15 op #define LOGE(c, fmt, ...) logs(LOG_ERR,     c, fmt, __VA_ARGS__)
 59 dafb57b8 2021-01-15 op #define LOGW(c, fmt, ...) logs(LOG_WARNING, c, fmt, __VA_ARGS__)
 60 dafb57b8 2021-01-15 op #define LOGN(c, fmt, ...) logs(LOG_NOTICE,  c, fmt, __VA_ARGS__)
 61 dafb57b8 2021-01-15 op #define LOGI(c, fmt, ...) logs(LOG_INFO,    c, fmt, __VA_ARGS__)
 62 dafb57b8 2021-01-15 op #define LOGD(c, fmt, ...) logs(LOG_DEBUG,   c, fmt, __VA_ARGS__)
 63 dafb57b8 2021-01-15 op 
 64 c8b74339 2021-01-24 op struct location {
 65 fe5967cd 2021-01-27 op 	const char	*match;
 66 fe5967cd 2021-01-27 op 	const char	*lang;
 67 fe5967cd 2021-01-27 op 	const char	*default_mime;
 68 fe5967cd 2021-01-27 op 	const char	*index;
 69 252908e6 2021-01-24 op 	int		 auto_index; /* 0 auto, -1 off, 1 on */
 70 c8b74339 2021-01-24 op };
 71 c8b74339 2021-01-24 op 
 72 15902770 2021-01-15 op struct vhost {
 73 15902770 2021-01-15 op 	const char	*domain;
 74 15902770 2021-01-15 op 	const char	*cert;
 75 15902770 2021-01-15 op 	const char	*key;
 76 15902770 2021-01-15 op 	const char	*dir;
 77 15902770 2021-01-15 op 	const char	*cgi;
 78 15902770 2021-01-15 op 	int		 dirfd;
 79 6016a593 2021-01-30 op 
 80 6016a593 2021-01-30 op 	/* the first location rule is always '*' and holds the default
 81 6016a593 2021-01-30 op 	 * settings for the vhost, from locations[1] onwards there are
 82 6016a593 2021-01-30 op 	 * the "real" location rules specified in the configuration. */
 83 c8b74339 2021-01-24 op 	struct location	 locations[LOCLEN];
 84 15902770 2021-01-15 op };
 85 15902770 2021-01-15 op 
 86 15902770 2021-01-15 op extern struct vhost hosts[HOSTSLEN];
 87 15902770 2021-01-15 op 
 88 a010b0dd 2021-01-18 op struct etm {			/* extension to mime */
 89 a010b0dd 2021-01-18 op 	const char	*mime;
 90 a010b0dd 2021-01-18 op 	const char	*ext;
 91 a010b0dd 2021-01-18 op };
 92 a010b0dd 2021-01-18 op 
 93 b2a6b613 2021-01-21 op struct mime {
 94 a010b0dd 2021-01-18 op 	struct etm	*t;
 95 a010b0dd 2021-01-18 op 	size_t		len;
 96 a010b0dd 2021-01-18 op 	size_t		cap;
 97 a010b0dd 2021-01-18 op };
 98 a010b0dd 2021-01-18 op 
 99 15902770 2021-01-15 op struct conf {
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 15902770 2021-01-15 op };
107 15902770 2021-01-15 op 
108 15902770 2021-01-15 op extern struct conf conf;
109 881a9dd9 2021-01-16 op extern int exfd;
110 15902770 2021-01-15 op 
111 0be51733 2021-01-20 op struct iri {
112 0be51733 2021-01-20 op 	char		*schema;
113 0be51733 2021-01-20 op 	char		*host;
114 0be51733 2021-01-20 op 	char		*port;
115 0be51733 2021-01-20 op 	uint16_t	 port_no;
116 0be51733 2021-01-20 op 	char		*path;
117 0be51733 2021-01-20 op 	char		*query;
118 0be51733 2021-01-20 op 	char		*fragment;
119 0be51733 2021-01-20 op };
120 0be51733 2021-01-20 op 
121 0be51733 2021-01-20 op struct parser {
122 0be51733 2021-01-20 op 	char		*iri;
123 0be51733 2021-01-20 op 	struct iri	*parsed;
124 0be51733 2021-01-20 op 	const char	*err;
125 0be51733 2021-01-20 op };
126 0be51733 2021-01-20 op 
127 488f059a 2020-12-24 op enum {
128 9862b637 2021-01-13 op 	S_HANDSHAKE,
129 488f059a 2020-12-24 op 	S_OPEN,
130 488f059a 2020-12-24 op 	S_INITIALIZING,
131 a87f6625 2021-01-24 op 	S_SENDING_FILE,
132 252908e6 2021-01-24 op 	S_SENDING_DIR,
133 a87f6625 2021-01-24 op 	S_SENDING_CGI,
134 488f059a 2020-12-24 op 	S_CLOSING,
135 488f059a 2020-12-24 op };
136 488f059a 2020-12-24 op 
137 488f059a 2020-12-24 op struct client {
138 488f059a 2020-12-24 op 	struct tls	*ctx;
139 0be51733 2021-01-20 op 	char		 req[GEMINI_URL_LEN];
140 0be51733 2021-01-20 op 	struct iri	 iri;
141 3300cbe0 2021-01-27 op 	char		 domain[DOMAIN_NAME_LEN];
142 a87f6625 2021-01-24 op 	int		 state, next;
143 488f059a 2020-12-24 op 	int		 code;
144 488f059a 2020-12-24 op 	const char	*meta;
145 488f059a 2020-12-24 op 	int		 fd, waiting_on_child;
146 488f059a 2020-12-24 op 	char		 sbuf[1024];	  /* static buffer */
147 488f059a 2020-12-24 op 	void		*buf, *i;	  /* mmap buffer */
148 488f059a 2020-12-24 op 	ssize_t		 len, off;	  /* mmap/static buffer  */
149 252908e6 2021-01-24 op 	DIR		*dir;
150 709d6e5e 2021-01-10 op 	struct sockaddr_storage	 addr;
151 f7b816dc 2021-01-15 op 	struct vhost	*host;	/* host she's talking to */
152 488f059a 2020-12-24 op };
153 488f059a 2020-12-24 op 
154 488f059a 2020-12-24 op enum {
155 488f059a 2020-12-24 op 	FILE_EXISTS,
156 488f059a 2020-12-24 op 	FILE_EXECUTABLE,
157 488f059a 2020-12-24 op 	FILE_DIRECTORY,
158 488f059a 2020-12-24 op 	FILE_MISSING,
159 488f059a 2020-12-24 op };
160 488f059a 2020-12-24 op 
161 33d32d1f 2020-12-25 op /* gmid.c */
162 d3a08f4d 2021-01-17 op __attribute__((format (printf, 1, 2)))
163 d3a08f4d 2021-01-17 op __attribute__((__noreturn__))
164 d3a08f4d 2021-01-17 op void fatal(const char*, ...);
165 d3a08f4d 2021-01-17 op 
166 d3a08f4d 2021-01-17 op __attribute__((format (printf, 3, 4)))
167 d3a08f4d 2021-01-17 op void logs(int, struct client*, const char*, ...);
168 0be51733 2021-01-20 op void log_request(struct client*, char*, size_t);
169 d3a08f4d 2021-01-17 op 
170 4a28dd01 2020-12-28 op void		 sig_handler(int);
171 8443bff7 2021-01-25 op void		 gen_certificate(const char*, const char*, const char*);
172 8443bff7 2021-01-25 op void		 mkdirs(const char*);
173 8443bff7 2021-01-25 op char		*data_dir(void);
174 8443bff7 2021-01-25 op void		 load_local_cert(const char*, const char*);
175 ae08ec7d 2021-01-25 op void		 load_vhosts(void);
176 33ac26a0 2021-01-21 op int		 make_socket(int, int);
177 ae08ec7d 2021-01-25 op void		 setup_tls(void);
178 33ac26a0 2021-01-21 op int		 listener_main(void);
179 c8b74339 2021-01-24 op void		 init_config(void);
180 ae08ec7d 2021-01-25 op void		 drop_priv(void);
181 488f059a 2020-12-24 op void		 usage(const char*);
182 488f059a 2020-12-24 op 
183 f7b816dc 2021-01-15 op /* provided by lex/yacc */
184 15902770 2021-01-15 op extern FILE *yyin;
185 15902770 2021-01-15 op extern int yylineno;
186 15902770 2021-01-15 op extern int yyparse(void);
187 15902770 2021-01-15 op extern int yylex(void);
188 15902770 2021-01-15 op 
189 13ed2fb6 2021-01-27 op void		 yyerror(const char*);
190 13ed2fb6 2021-01-27 op int		 parse_portno(const char*);
191 13ed2fb6 2021-01-27 op void		 parse_conf(const char*);
192 13ed2fb6 2021-01-27 op 
193 0fbe79b3 2021-01-18 op /* mime.c */
194 b2a6b613 2021-01-21 op void		 init_mime(struct mime*);
195 b2a6b613 2021-01-21 op void		 add_mime(struct mime*, const char*, const char*);
196 b2a6b613 2021-01-21 op void		 load_default_mime(struct mime*);
197 6119e13e 2021-01-19 op const char	*mime(struct vhost*, const char*);
198 0fbe79b3 2021-01-18 op 
199 d3a08f4d 2021-01-17 op /* server.c */
200 c8b74339 2021-01-24 op const char	*vhost_lang(struct vhost*, const char*);
201 c8b74339 2021-01-24 op const char	*vhost_default_mime(struct vhost*, const char*);
202 c8b74339 2021-01-24 op const char	*vhost_index(struct vhost*, const char*);
203 252908e6 2021-01-24 op int		 vhost_auto_index(struct vhost*, const char*);
204 d3a08f4d 2021-01-17 op int		 check_path(struct client*, const char*, int*);
205 07b0a142 2021-01-24 op void		 open_file(struct pollfd*, struct client*);
206 252908e6 2021-01-24 op void		 load_file(struct pollfd*, struct client*);
207 07b0a142 2021-01-24 op void		 check_for_cgi(char *, char*, struct pollfd*, struct client*);
208 d3a08f4d 2021-01-17 op void		 mark_nonblock(int);
209 d3a08f4d 2021-01-17 op void		 handle_handshake(struct pollfd*, struct client*);
210 d3a08f4d 2021-01-17 op void		 handle_open_conn(struct pollfd*, struct client*);
211 a87f6625 2021-01-24 op void		 start_reply(struct pollfd*, struct client*, int, const char*);
212 07b0a142 2021-01-24 op void		 start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
213 0be51733 2021-01-20 op void		 send_file(struct pollfd*, struct client*);
214 252908e6 2021-01-24 op void		 open_dir(struct pollfd*, struct client*);
215 252908e6 2021-01-24 op void		 redirect_canonical_dir(struct pollfd*, struct client*);
216 252908e6 2021-01-24 op int		 read_next_dir_entry(struct client*);
217 252908e6 2021-01-24 op void		 send_directory_listing(struct pollfd*, struct client*);
218 d3a08f4d 2021-01-17 op void		 cgi_poll_on_child(struct pollfd*, struct client*);
219 d3a08f4d 2021-01-17 op void		 cgi_poll_on_client(struct pollfd*, struct client*);
220 d3a08f4d 2021-01-17 op void		 handle_cgi(struct pollfd*, struct client*);
221 36162ed8 2021-01-22 op void		 close_conn(struct pollfd*, struct client*);
222 d3a08f4d 2021-01-17 op void		 do_accept(int, struct tls*, struct pollfd*, struct client*);
223 d3a08f4d 2021-01-17 op void		 handle(struct pollfd*, struct client*);
224 d3a08f4d 2021-01-17 op void		 loop(struct tls*, int, int);
225 d3a08f4d 2021-01-17 op 
226 881a9dd9 2021-01-16 op /* ex.c */
227 881a9dd9 2021-01-16 op int		 send_string(int, const char*);
228 881a9dd9 2021-01-16 op int		 recv_string(int, char**);
229 881a9dd9 2021-01-16 op int		 send_vhost(int, struct vhost*);
230 881a9dd9 2021-01-16 op int		 recv_vhost(int, struct vhost**);
231 881a9dd9 2021-01-16 op int		 send_fd(int, int);
232 881a9dd9 2021-01-16 op int		 recv_fd(int);
233 881a9dd9 2021-01-16 op int		 executor_main(int);
234 881a9dd9 2021-01-16 op 
235 dafb57b8 2021-01-15 op /* sandbox.c */
236 33ac26a0 2021-01-21 op void		 sandbox(void);
237 dafb57b8 2021-01-15 op 
238 ef04b551 2021-01-09 op /* utf8.c */
239 ef04b551 2021-01-09 op int		 valid_multibyte_utf8(struct parser*);
240 3300cbe0 2021-01-27 op char		*utf8_nth(char*, size_t);
241 ef04b551 2021-01-09 op 
242 3c1cf9d0 2021-01-11 op /* iri.c */
243 3c1cf9d0 2021-01-11 op int		 parse_iri(char*, struct iri*, const char**);
244 c4f682f8 2021-01-27 op int		 trim_req_iri(char*, const char **);
245 33d32d1f 2020-12-25 op 
246 3300cbe0 2021-01-27 op /* puny.c */
247 a2fd8013 2021-01-29 op int		 puny_decode(const char*, char*, size_t, const char**);
248 3300cbe0 2021-01-27 op 
249 44ee1bac 2021-01-27 op /* utils.c */
250 44ee1bac 2021-01-27 op int		 starts_with(const char*, const char*);
251 44ee1bac 2021-01-27 op int		 ends_with(const char*, const char*);
252 44ee1bac 2021-01-27 op ssize_t		 filesize(int);
253 44ee1bac 2021-01-27 op 
254 488f059a 2020-12-24 op #endif