1 /*
2  * Copyright (c) 2020 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 #ifndef GMID_H
18 #define GMID_H
19 
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
22 #include <sys/socket.h>
23 
24 #include <poll.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <syslog.h>
28 #include <tls.h>
29 #include <unistd.h>
30 
31 #include "config.h"
32 
33 #ifndef INFTIM
34 # define INFTIM -1
35 #endif
36 
37 #define GEMINI_URL_LEN (1024+3)	/* URL max len + \r\n + \0 */
38 
39 /* large enough to hold a copy of a gemini URL and still have extra room */
40 #define PATHBUF		2048
41 
42 #define SUCCESS		20
43 #define TEMP_REDIRECT	30
44 #define TEMP_FAILURE	40
45 #define NOT_FOUND	51
46 #define PROXY_REFUSED	53
47 #define BAD_REQUEST	59
48 
49 #define MAX_USERS	64
50 
51 #define HOSTSLEN	64
52 #define LOCLEN		32
53 
54 #define LOGE(c, fmt, ...) logs(LOG_ERR,     c, fmt, __VA_ARGS__)
55 #define LOGW(c, fmt, ...) logs(LOG_WARNING, c, fmt, __VA_ARGS__)
56 #define LOGN(c, fmt, ...) logs(LOG_NOTICE,  c, fmt, __VA_ARGS__)
57 #define LOGI(c, fmt, ...) logs(LOG_INFO,    c, fmt, __VA_ARGS__)
58 #define LOGD(c, fmt, ...) logs(LOG_DEBUG,   c, fmt, __VA_ARGS__)
59 
60 struct location {
61 	char		*match;
62 	char		*lang;
63 	char		*default_mime;
64 	char		*index;
65 };
66 
67 struct vhost {
68 	const char	*domain;
69 	const char	*cert;
70 	const char	*key;
71 	const char	*dir;
72 	const char	*cgi;
73 	int		 dirfd;
74 	struct location	 locations[LOCLEN];
75 };
76 
77 extern struct vhost hosts[HOSTSLEN];
78 
79 struct etm {			/* extension to mime */
80 	const char	*mime;
81 	const char	*ext;
82 };
83 
84 struct mime {
85 	struct etm	*t;
86 	size_t		len;
87 	size_t		cap;
88 };
89 
90 struct conf {
91 	int		foreground;
92 	int		port;
93 	int		ipv6;
94 	uint32_t	protos;
95 	struct mime	mime;
96 };
97 
98 extern struct conf conf;
99 extern int exfd;
100 
101 struct iri {
102 	char		*schema;
103 	char		*host;
104 	char		*port;
105 	uint16_t	 port_no;
106 	char		*path;
107 	char		*query;
108 	char		*fragment;
109 };
110 
111 struct parser {
112 	char		*iri;
113 	struct iri	*parsed;
114 	const char	*err;
115 };
116 
117 enum {
118 	S_HANDSHAKE,
119 	S_OPEN,
120 	S_INITIALIZING,
121 	S_SENDING_FILE,
122 	S_SENDING_CGI,
123 	S_CLOSING,
124 };
125 
126 struct client {
127 	struct tls	*ctx;
128 	char		 req[GEMINI_URL_LEN];
129 	struct iri	 iri;
130 	int		 state, next;
131 	int		 code;
132 	const char	*meta;
133 	int		 fd, waiting_on_child;
134 	char		 sbuf[1024];	  /* static buffer */
135 	void		*buf, *i;	  /* mmap buffer */
136 	ssize_t		 len, off;	  /* mmap/static buffer  */
137 	struct sockaddr_storage	 addr;
138 	struct vhost	*host;	/* host she's talking to */
139 };
140 
141 enum {
142 	FILE_EXISTS,
143 	FILE_EXECUTABLE,
144 	FILE_DIRECTORY,
145 	FILE_MISSING,
146 };
147 
148 /* gmid.c */
149 
150 __attribute__((format (printf, 1, 2)))
151 __attribute__((__noreturn__))
152 void fatal(const char*, ...);
153 
154 __attribute__((format (printf, 3, 4)))
155 void logs(int, struct client*, const char*, ...);
156 void log_request(struct client*, char*, size_t);
157 
158 void		 sig_handler(int);
159 int		 starts_with(const char*, const char*);
160 int		 ends_with(const char*, const char*);
161 ssize_t		 filesize(int);
162 char		*absolutify_path(const char*);
163 void		 yyerror(const char*);
164 int		 parse_portno(const char*);
165 void		 parse_conf(const char*);
166 void		 load_vhosts(struct tls_config*);
167 int		 make_socket(int, int);
168 int		 listener_main(void);
169 void		 init_config(void);
170 void		 usage(const char*);
171 
172 /* provided by lex/yacc */
173 extern FILE *yyin;
174 extern int yylineno;
175 extern int yyparse(void);
176 extern int yylex(void);
177 
178 /* mime.c */
179 void		 init_mime(struct mime*);
180 void		 add_mime(struct mime*, const char*, const char*);
181 void		 load_default_mime(struct mime*);
182 const char	*mime(struct vhost*, const char*);
183 
184 /* server.c */
185 const char	*vhost_lang(struct vhost*, const char*);
186 const char	*vhost_default_mime(struct vhost*, const char*);
187 const char	*vhost_index(struct vhost*, const char*);
188 int		 check_path(struct client*, const char*, int*);
189 void		 open_file(struct pollfd*, struct client*);
190 void		 check_for_cgi(char *, char*, struct pollfd*, struct client*);
191 void		 mark_nonblock(int);
192 void		 handle_handshake(struct pollfd*, struct client*);
193 void		 handle_open_conn(struct pollfd*, struct client*);
194 void		 start_reply(struct pollfd*, struct client*, int, const char*);
195 void		 start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
196 void		 send_file(struct pollfd*, struct client*);
197 void		 send_dir(struct pollfd*, struct client*);
198 void		 cgi_poll_on_child(struct pollfd*, struct client*);
199 void		 cgi_poll_on_client(struct pollfd*, struct client*);
200 void		 handle_cgi(struct pollfd*, struct client*);
201 void		 close_conn(struct pollfd*, struct client*);
202 void		 do_accept(int, struct tls*, struct pollfd*, struct client*);
203 void		 handle(struct pollfd*, struct client*);
204 void		 loop(struct tls*, int, int);
205 
206 /* ex.c */
207 int		 send_string(int, const char*);
208 int		 recv_string(int, char**);
209 int		 send_vhost(int, struct vhost*);
210 int		 recv_vhost(int, struct vhost**);
211 int		 send_fd(int, int);
212 int		 recv_fd(int);
213 int		 executor_main(int);
214 
215 /* sandbox.c */
216 void		 sandbox(void);
217 
218 /* utf8.c */
219 int		 valid_multibyte_utf8(struct parser*);
220 
221 /* iri.c */
222 int		 parse_iri(char*, struct iri*, const char**);
223 int		 trim_req_iri(char*);
224 
225 #endif