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