1 d5aba4c7 2020-12-24 op /*
  2 d5aba4c7 2020-12-24 op  * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
  3 d5aba4c7 2020-12-24 op  *
  4 d5aba4c7 2020-12-24 op  * Permission to use, copy, modify, and distribute this software for any
  5 d5aba4c7 2020-12-24 op  * purpose with or without fee is hereby granted, provided that the above
  6 d5aba4c7 2020-12-24 op  * copyright notice and this permission notice appear in all copies.
  7 d5aba4c7 2020-12-24 op  *
  8 d5aba4c7 2020-12-24 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 d5aba4c7 2020-12-24 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 d5aba4c7 2020-12-24 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 d5aba4c7 2020-12-24 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 d5aba4c7 2020-12-24 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 d5aba4c7 2020-12-24 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 d5aba4c7 2020-12-24 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 d5aba4c7 2020-12-24 op  */
 16 d5aba4c7 2020-12-24 op 
 17 488f059a 2020-12-24 op #ifndef GMID_H
 18 488f059a 2020-12-24 op #define GMID_H
 19 488f059a 2020-12-24 op 
 20 488f059a 2020-12-24 op #include <arpa/inet.h>
 21 488f059a 2020-12-24 op #include <netinet/in.h>
 22 28778244 2021-01-11 op #include <sys/socket.h>
 23 488f059a 2020-12-24 op 
 24 488f059a 2020-12-24 op #include <poll.h>
 25 488f059a 2020-12-24 op #include <stdio.h>
 26 488f059a 2020-12-24 op #include <stdlib.h>
 27 488f059a 2020-12-24 op #include <syslog.h>
 28 488f059a 2020-12-24 op #include <tls.h>
 29 488f059a 2020-12-24 op #include <unistd.h>
 30 488f059a 2020-12-24 op 
 31 488f059a 2020-12-24 op #ifndef INFTIM
 32 488f059a 2020-12-24 op # define INFTIM -1
 33 488f059a 2020-12-24 op #endif
 34 488f059a 2020-12-24 op 
 35 488f059a 2020-12-24 op #define GEMINI_URL_LEN (1024+3)	/* URL max len + \r\n + \0 */
 36 488f059a 2020-12-24 op 
 37 488f059a 2020-12-24 op /* large enough to hold a copy of a gemini URL and still have extra room */
 38 488f059a 2020-12-24 op #define PATHBUF		2048
 39 488f059a 2020-12-24 op 
 40 488f059a 2020-12-24 op #define SUCCESS		20
 41 0be51733 2021-01-20 op #define TEMP_REDIRECT	30
 42 488f059a 2020-12-24 op #define TEMP_FAILURE	40
 43 488f059a 2020-12-24 op #define NOT_FOUND	51
 44 7b1d9790 2021-01-11 op #define PROXY_REFUSED	53
 45 488f059a 2020-12-24 op #define BAD_REQUEST	59
 46 488f059a 2020-12-24 op 
 47 488f059a 2020-12-24 op #define MAX_USERS	64
 48 488f059a 2020-12-24 op 
 49 15902770 2021-01-15 op #define HOSTSLEN	64
 50 15902770 2021-01-15 op 
 51 dafb57b8 2021-01-15 op #define LOGE(c, fmt, ...) logs(LOG_ERR,     c, fmt, __VA_ARGS__)
 52 dafb57b8 2021-01-15 op #define LOGW(c, fmt, ...) logs(LOG_WARNING, c, fmt, __VA_ARGS__)
 53 dafb57b8 2021-01-15 op #define LOGN(c, fmt, ...) logs(LOG_NOTICE,  c, fmt, __VA_ARGS__)
 54 dafb57b8 2021-01-15 op #define LOGI(c, fmt, ...) logs(LOG_INFO,    c, fmt, __VA_ARGS__)
 55 dafb57b8 2021-01-15 op #define LOGD(c, fmt, ...) logs(LOG_DEBUG,   c, fmt, __VA_ARGS__)
 56 dafb57b8 2021-01-15 op 
 57 15902770 2021-01-15 op struct vhost {
 58 15902770 2021-01-15 op 	const char	*domain;
 59 15902770 2021-01-15 op 	const char	*cert;
 60 15902770 2021-01-15 op 	const char	*key;
 61 15902770 2021-01-15 op 	const char	*dir;
 62 15902770 2021-01-15 op 	const char	*cgi;
 63 05c23a54 2021-01-19 op 	char		*lang;
 64 15902770 2021-01-15 op 	int		 dirfd;
 65 6119e13e 2021-01-19 op 	char		*default_mime;
 66 15902770 2021-01-15 op };
 67 15902770 2021-01-15 op 
 68 15902770 2021-01-15 op extern struct vhost hosts[HOSTSLEN];
 69 15902770 2021-01-15 op 
 70 a010b0dd 2021-01-18 op struct etm {			/* extension to mime */
 71 a010b0dd 2021-01-18 op 	const char	*mime;
 72 a010b0dd 2021-01-18 op 	const char	*ext;
 73 a010b0dd 2021-01-18 op };
 74 a010b0dd 2021-01-18 op 
 75 a010b0dd 2021-01-18 op struct mimes {
 76 a010b0dd 2021-01-18 op 	struct etm	*t;
 77 a010b0dd 2021-01-18 op 	size_t		len;
 78 a010b0dd 2021-01-18 op 	size_t		cap;
 79 a010b0dd 2021-01-18 op };
 80 a010b0dd 2021-01-18 op 
 81 15902770 2021-01-15 op struct conf {
 82 a010b0dd 2021-01-18 op 	int		foreground;
 83 a010b0dd 2021-01-18 op 	int		port;
 84 a010b0dd 2021-01-18 op 	int		ipv6;
 85 a010b0dd 2021-01-18 op 	uint32_t	protos;
 86 a010b0dd 2021-01-18 op 	struct mimes	mimes;
 87 15902770 2021-01-15 op };
 88 15902770 2021-01-15 op 
 89 15902770 2021-01-15 op extern struct conf conf;
 90 881a9dd9 2021-01-16 op extern int exfd;
 91 15902770 2021-01-15 op 
 92 0be51733 2021-01-20 op struct iri {
 93 0be51733 2021-01-20 op 	char		*schema;
 94 0be51733 2021-01-20 op 	char		*host;
 95 0be51733 2021-01-20 op 	char		*port;
 96 0be51733 2021-01-20 op 	uint16_t	 port_no;
 97 0be51733 2021-01-20 op 	char		*path;
 98 0be51733 2021-01-20 op 	char		*query;
 99 0be51733 2021-01-20 op 	char		*fragment;
100 0be51733 2021-01-20 op };
101 0be51733 2021-01-20 op 
102 0be51733 2021-01-20 op struct parser {
103 0be51733 2021-01-20 op 	char		*iri;
104 0be51733 2021-01-20 op 	struct iri	*parsed;
105 0be51733 2021-01-20 op 	const char	*err;
106 0be51733 2021-01-20 op };
107 0be51733 2021-01-20 op 
108 488f059a 2020-12-24 op enum {
109 9862b637 2021-01-13 op 	S_HANDSHAKE,
110 488f059a 2020-12-24 op 	S_OPEN,
111 488f059a 2020-12-24 op 	S_INITIALIZING,
112 488f059a 2020-12-24 op 	S_SENDING,
113 488f059a 2020-12-24 op 	S_CLOSING,
114 488f059a 2020-12-24 op };
115 488f059a 2020-12-24 op 
116 488f059a 2020-12-24 op struct client {
117 488f059a 2020-12-24 op 	struct tls	*ctx;
118 0be51733 2021-01-20 op 	char		 req[GEMINI_URL_LEN];
119 0be51733 2021-01-20 op 	struct iri	 iri;
120 488f059a 2020-12-24 op 	int		 state;
121 488f059a 2020-12-24 op 	int		 code;
122 488f059a 2020-12-24 op 	const char	*meta;
123 488f059a 2020-12-24 op 	int		 fd, waiting_on_child;
124 881a9dd9 2021-01-16 op 	int		 child;
125 488f059a 2020-12-24 op 	char		 sbuf[1024];	  /* static buffer */
126 488f059a 2020-12-24 op 	void		*buf, *i;	  /* mmap buffer */
127 488f059a 2020-12-24 op 	ssize_t		 len, off;	  /* mmap/static buffer  */
128 709d6e5e 2021-01-10 op 	struct sockaddr_storage	 addr;
129 f7b816dc 2021-01-15 op 	struct vhost	*host;	/* host she's talking to */
130 488f059a 2020-12-24 op };
131 488f059a 2020-12-24 op 
132 488f059a 2020-12-24 op enum {
133 488f059a 2020-12-24 op 	FILE_EXISTS,
134 488f059a 2020-12-24 op 	FILE_EXECUTABLE,
135 488f059a 2020-12-24 op 	FILE_DIRECTORY,
136 488f059a 2020-12-24 op 	FILE_MISSING,
137 488f059a 2020-12-24 op };
138 488f059a 2020-12-24 op 
139 33d32d1f 2020-12-25 op /* gmid.c */
140 dafb57b8 2021-01-15 op 
141 d3a08f4d 2021-01-17 op __attribute__((format (printf, 1, 2)))
142 d3a08f4d 2021-01-17 op __attribute__((__noreturn__))
143 d3a08f4d 2021-01-17 op void fatal(const char*, ...);
144 d3a08f4d 2021-01-17 op 
145 d3a08f4d 2021-01-17 op __attribute__((format (printf, 3, 4)))
146 d3a08f4d 2021-01-17 op void logs(int, struct client*, const char*, ...);
147 0be51733 2021-01-20 op void log_request(struct client*, char*, size_t);
148 d3a08f4d 2021-01-17 op 
149 4a28dd01 2020-12-28 op void		 sig_handler(int);
150 488f059a 2020-12-24 op int		 starts_with(const char*, const char*);
151 3d9a1c73 2020-12-28 op ssize_t		 filesize(int);
152 15902770 2021-01-15 op char		*absolutify_path(const char*);
153 15902770 2021-01-15 op void		 yyerror(const char*);
154 15902770 2021-01-15 op int		 parse_portno(const char*);
155 15902770 2021-01-15 op void		 parse_conf(const char*);
156 15902770 2021-01-15 op void		 load_vhosts(struct tls_config*);
157 d3a08f4d 2021-01-17 op int		 make_soket(int);
158 881a9dd9 2021-01-16 op int		 listener_main();
159 488f059a 2020-12-24 op void		 usage(const char*);
160 488f059a 2020-12-24 op 
161 f7b816dc 2021-01-15 op /* provided by lex/yacc */
162 15902770 2021-01-15 op extern FILE *yyin;
163 15902770 2021-01-15 op extern int yylineno;
164 15902770 2021-01-15 op extern int yyparse(void);
165 15902770 2021-01-15 op extern int yylex(void);
166 15902770 2021-01-15 op 
167 0fbe79b3 2021-01-18 op /* mime.c */
168 0fbe79b3 2021-01-18 op void		 init_mime(void);
169 0fbe79b3 2021-01-18 op void		 add_mime(const char*, const char*);
170 0fbe79b3 2021-01-18 op void		 load_default_mime(void);
171 982069a1 2021-01-18 op int		 load_mime_file(const char*);
172 6119e13e 2021-01-19 op const char	*mime(struct vhost*, const char*);
173 0fbe79b3 2021-01-18 op 
174 d3a08f4d 2021-01-17 op /* server.c */
175 d3a08f4d 2021-01-17 op int		 check_path(struct client*, const char*, int*);
176 0be51733 2021-01-20 op int		 open_file(struct pollfd*, struct client*);
177 d3a08f4d 2021-01-17 op int		 check_for_cgi(char *, char*, struct pollfd*, struct client*);
178 d3a08f4d 2021-01-17 op void		 mark_nonblock(int);
179 d3a08f4d 2021-01-17 op void		 handle_handshake(struct pollfd*, struct client*);
180 d3a08f4d 2021-01-17 op void		 handle_open_conn(struct pollfd*, struct client*);
181 d3a08f4d 2021-01-17 op int		 start_reply(struct pollfd*, struct client*, int, const char*);
182 d3a08f4d 2021-01-17 op int		 start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
183 0be51733 2021-01-20 op void		 send_file(struct pollfd*, struct client*);
184 0be51733 2021-01-20 op void		 send_dir(struct pollfd*, struct client*);
185 d3a08f4d 2021-01-17 op void		 cgi_poll_on_child(struct pollfd*, struct client*);
186 d3a08f4d 2021-01-17 op void		 cgi_poll_on_client(struct pollfd*, struct client*);
187 d3a08f4d 2021-01-17 op void		 handle_cgi(struct pollfd*, struct client*);
188 d3a08f4d 2021-01-17 op void		 goodbye(struct pollfd*, struct client*);
189 d3a08f4d 2021-01-17 op void		 do_accept(int, struct tls*, struct pollfd*, struct client*);
190 d3a08f4d 2021-01-17 op void		 handle(struct pollfd*, struct client*);
191 d3a08f4d 2021-01-17 op void		 loop(struct tls*, int, int);
192 d3a08f4d 2021-01-17 op 
193 881a9dd9 2021-01-16 op /* ex.c */
194 881a9dd9 2021-01-16 op int		 send_string(int, const char*);
195 881a9dd9 2021-01-16 op int		 recv_string(int, char**);
196 881a9dd9 2021-01-16 op int		 send_vhost(int, struct vhost*);
197 881a9dd9 2021-01-16 op int		 recv_vhost(int, struct vhost**);
198 881a9dd9 2021-01-16 op int		 send_fd(int, int);
199 881a9dd9 2021-01-16 op int		 recv_fd(int);
200 881a9dd9 2021-01-16 op int		 executor_main(int);
201 881a9dd9 2021-01-16 op 
202 dafb57b8 2021-01-15 op /* sandbox.c */
203 dafb57b8 2021-01-15 op void		 sandbox();
204 dafb57b8 2021-01-15 op 
205 ef04b551 2021-01-09 op /* utf8.c */
206 ef04b551 2021-01-09 op int		 valid_multibyte_utf8(struct parser*);
207 ef04b551 2021-01-09 op 
208 3c1cf9d0 2021-01-11 op /* iri.c */
209 3c1cf9d0 2021-01-11 op int		 parse_iri(char*, struct iri*, const char**);
210 3c1cf9d0 2021-01-11 op int		 trim_req_iri(char*);
211 33d32d1f 2020-12-25 op 
212 488f059a 2020-12-24 op #endif