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 
23 #include <poll.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <syslog.h>
27 #include <tls.h>
28 #include <unistd.h>
29 
30 #ifndef __OpenBSD__
31 # define pledge(a, b) 0
32 # define unveil(a, b) 0
33 #endif
34 
35 #ifndef INFTIM
36 # define INFTIM -1
37 #endif
38 
39 #define GEMINI_URL_LEN (1024+3)	/* URL max len + \r\n + \0 */
40 
41 /* large enough to hold a copy of a gemini URL and still have extra room */
42 #define PATHBUF		2048
43 
44 #define SUCCESS		20
45 #define TEMP_FAILURE	40
46 #define NOT_FOUND	51
47 #define BAD_REQUEST	59
48 
49 #define MAX_USERS	64
50 
51 enum {
52 	S_OPEN,
53 	S_INITIALIZING,
54 	S_SENDING,
55 	S_CLOSING,
56 };
57 
58 struct client {
59 	struct tls	*ctx;
60 	int		 state;
61 	int		 code;
62 	const char	*meta;
63 	int		 fd, waiting_on_child;
64 	pid_t		 child;
65 	char		 sbuf[1024];	  /* static buffer */
66 	void		*buf, *i;	  /* mmap buffer */
67 	ssize_t		 len, off;	  /* mmap/static buffer  */
68 	int		 af;
69 	struct sockaddr_storage	 addr;
70 };
71 
72 struct uri {
73 	char		*schema;
74 	char		*host;
75 	char		*port;
76 	uint16_t	 port_no;
77 	char		*path;
78 	char		*query;
79 	char		*fragment;
80 };
81 
82 struct parser {
83 	char		*uri;
84 	struct uri	*parsed;
85 	const char	*err;
86 };
87 
88 enum {
89 	FILE_EXISTS,
90 	FILE_EXECUTABLE,
91 	FILE_DIRECTORY,
92 	FILE_MISSING,
93 };
94 
95 /* gmid.c */
96 void		 sig_handler(int);
97 int		 starts_with(const char*, const char*);
98 
99 int		 start_reply(struct pollfd*, struct client*, int, const char*);
100 ssize_t		 filesize(int);
101 const char	*path_ext(const char*);
102 const char	*mime(const char*);
103 int		 check_path(struct client*, const char*, int*);
104 int		 check_for_cgi(char *, char*, struct pollfd*, struct client*);
105 int		 open_file(char*, char*, struct pollfd*, struct client*);
106 int		 start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
107 void		 cgi_poll_on_child(struct pollfd*, struct client*);
108 void		 cgi_poll_on_client(struct pollfd*, struct client*);
109 void		 handle_cgi(struct pollfd*, struct client*);
110 void		 send_file(char*, char*, struct pollfd*, struct client*);
111 void		 send_dir(char*, struct pollfd*, struct client*);
112 void		 handle(struct pollfd*, struct client*);
113 
114 void		 mark_nonblock(int);
115 int		 make_soket(int);
116 void		 do_accept(int, struct tls*, struct pollfd*, struct client*);
117 void		 goodbye(struct pollfd*, struct client*);
118 void		 loop(struct tls*, int, int);
119 
120 void		 usage(const char*);
121 
122 /* utf8.c */
123 int		 valid_multibyte_utf8(struct parser*);
124 
125 /* uri.c */
126 int		 parse_uri(char*, struct uri*, const char**);
127 int		 trim_req_uri(char*);
128 
129 #endif