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 __OpenBSD__
32 # define pledge(a, b) 0
33 # define unveil(a, b) 0
34 #endif
35 
36 #ifndef INFTIM
37 # define INFTIM -1
38 #endif
39 
40 #define GEMINI_URL_LEN (1024+3)	/* URL max len + \r\n + \0 */
41 
42 /* large enough to hold a copy of a gemini URL and still have extra room */
43 #define PATHBUF		2048
44 
45 #define SUCCESS		20
46 #define TEMP_FAILURE	40
47 #define NOT_FOUND	51
48 #define PROXY_REFUSED	53
49 #define BAD_REQUEST	59
50 
51 #define MAX_USERS	64
52 
53 #define HOSTSLEN	64
54 
55 struct vhost {
56 	const char	*domain;
57 	const char	*cert;
58 	const char	*key;
59 	const char	*dir;
60 	const char	*cgi;
61 	int		 dirfd;
62 };
63 
64 extern struct vhost hosts[HOSTSLEN];
65 
66 struct conf {
67 	int	foreground;
68 	int	port;
69 	int	ipv6;
70 };
71 
72 extern struct conf conf;
73 
74 enum {
75 	S_HANDSHAKE,
76 	S_OPEN,
77 	S_INITIALIZING,
78 	S_SENDING,
79 	S_CLOSING,
80 };
81 
82 struct client {
83 	struct tls	*ctx;
84 	int		 state;
85 	int		 code;
86 	const char	*meta;
87 	int		 fd, waiting_on_child;
88 	pid_t		 child;
89 	char		 sbuf[1024];	  /* static buffer */
90 	void		*buf, *i;	  /* mmap buffer */
91 	ssize_t		 len, off;	  /* mmap/static buffer  */
92 	int		 af;
93 	struct sockaddr_storage	 addr;
94 	struct vhost	*host;	/* host he's talking to */
95 };
96 
97 struct iri {
98 	char		*schema;
99 	char		*host;
100 	char		*port;
101 	uint16_t	 port_no;
102 	char		*path;
103 	char		*query;
104 	char		*fragment;
105 };
106 
107 struct parser {
108 	char		*iri;
109 	struct iri	*parsed;
110 	const char	*err;
111 };
112 
113 enum {
114 	FILE_EXISTS,
115 	FILE_EXECUTABLE,
116 	FILE_DIRECTORY,
117 	FILE_MISSING,
118 };
119 
120 /* gmid.c */
121 void		 sig_handler(int);
122 int		 starts_with(const char*, const char*);
123 
124 int		 start_reply(struct pollfd*, struct client*, int, const char*);
125 ssize_t		 filesize(int);
126 const char	*path_ext(const char*);
127 const char	*mime(const char*);
128 int		 check_path(struct client*, const char*, int*);
129 int		 check_for_cgi(char *, char*, struct pollfd*, struct client*);
130 int		 open_file(char*, char*, struct pollfd*, struct client*);
131 int		 start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
132 void		 cgi_poll_on_child(struct pollfd*, struct client*);
133 void		 cgi_poll_on_client(struct pollfd*, struct client*);
134 void		 handle_cgi(struct pollfd*, struct client*);
135 void		 send_file(char*, char*, struct pollfd*, struct client*);
136 void		 send_dir(char*, struct pollfd*, struct client*);
137 void		 handle_handshake(struct pollfd*, struct client*);
138 void		 handle_open_conn(struct pollfd*, struct client*);
139 void		 handle(struct pollfd*, struct client*);
140 
141 void		 mark_nonblock(int);
142 int		 make_soket(int);
143 void		 do_accept(int, struct tls*, struct pollfd*, struct client*);
144 void		 goodbye(struct pollfd*, struct client*);
145 void		 loop(struct tls*, int, int);
146 
147 char		*absolutify_path(const char*);
148 void		 yyerror(const char*);
149 int		 parse_portno(const char*);
150 void		 parse_conf(const char*);
151 void		 load_vhosts(struct tls_config*);
152 void		 sandbox();
153 
154 void		 usage(const char*);
155 
156 extern FILE *yyin;
157 extern int yylineno;
158 extern int yyparse(void);
159 extern int yylex(void);
160 
161 /* utf8.c */
162 int		 valid_multibyte_utf8(struct parser*);
163 
164 /* iri.c */
165 int		 parse_iri(char*, struct iri*, const char**);
166 int		 trim_req_iri(char*);
167 
168 #endif