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 enum {
54 	S_HANDSHAKE,
55 	S_OPEN,
56 	S_INITIALIZING,
57 	S_SENDING,
58 	S_CLOSING,
59 };
60 
61 struct client {
62 	struct tls	*ctx;
63 	int		 state;
64 	int		 code;
65 	const char	*meta;
66 	int		 fd, waiting_on_child;
67 	pid_t		 child;
68 	char		 sbuf[1024];	  /* static buffer */
69 	void		*buf, *i;	  /* mmap buffer */
70 	ssize_t		 len, off;	  /* mmap/static buffer  */
71 	int		 af;
72 	struct sockaddr_storage	 addr;
73 };
74 
75 struct iri {
76 	char		*schema;
77 	char		*host;
78 	char		*port;
79 	uint16_t	 port_no;
80 	char		*path;
81 	char		*query;
82 	char		*fragment;
83 };
84 
85 struct parser {
86 	char		*iri;
87 	struct iri	*parsed;
88 	const char	*err;
89 };
90 
91 enum {
92 	FILE_EXISTS,
93 	FILE_EXECUTABLE,
94 	FILE_DIRECTORY,
95 	FILE_MISSING,
96 };
97 
98 /* gmid.c */
99 void		 sig_handler(int);
100 int		 starts_with(const char*, const char*);
101 
102 int		 start_reply(struct pollfd*, struct client*, int, const char*);
103 ssize_t		 filesize(int);
104 const char	*path_ext(const char*);
105 const char	*mime(const char*);
106 int		 check_path(struct client*, const char*, int*);
107 int		 check_for_cgi(char *, char*, struct pollfd*, struct client*);
108 int		 open_file(char*, char*, struct pollfd*, struct client*);
109 int		 start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
110 void		 cgi_poll_on_child(struct pollfd*, struct client*);
111 void		 cgi_poll_on_client(struct pollfd*, struct client*);
112 void		 handle_cgi(struct pollfd*, struct client*);
113 void		 send_file(char*, char*, struct pollfd*, struct client*);
114 void		 send_dir(char*, struct pollfd*, struct client*);
115 void		 handle_handshake(struct pollfd*, struct client*);
116 void		 handle_open_conn(struct pollfd*, struct client*);
117 void		 handle(struct pollfd*, struct client*);
118 
119 void		 mark_nonblock(int);
120 int		 make_soket(int);
121 void		 do_accept(int, struct tls*, struct pollfd*, struct client*);
122 void		 goodbye(struct pollfd*, struct client*);
123 void		 loop(struct tls*, int, int);
124 
125 void		 usage(const char*);
126 
127 /* utf8.c */
128 int		 valid_multibyte_utf8(struct parser*);
129 
130 /* iri.c */
131 int		 parse_iri(char*, struct iri*, const char**);
132 int		 trim_req_iri(char*);
133 
134 #endif