1 /*
2  * Copyright (c) 2021 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 TELESCOPE_H
18 #define TELESCOPE_H
19 
20 #include "compat.h"
21 
22 #include <limits.h>
23 
24 #include "cmd.h"
25 #include "phos/phos.h"
26 
27 #define MIN(a, b) ((a) < (b) ? (a) : (b))
28 #define MAX(a, b) ((a) > (b) ? (a) : (b))
29 
30 #define GEMINI_URL_LEN 1024
31 #define TITLE_MAX 128+1		/* account for NUL too */
32 
33 #define SIDE_WINDOW_LEFT	0x1
34 #define SIDE_WINDOW_BOTTOM	0x2
35 
36 struct imsgev {
37 	struct imsgbuf	 ibuf;
38 	void		(*handler)(int, short, void *);
39 	struct event	 ev;
40 	short		 events;
41 };
42 
43 enum imsg_type {
44 	/* ui <-> client/fs */
45 	IMSG_GET,		/* data is URL, peerid the tab id */
46 	IMSG_GET_FILE,		/* data is path, without \r\n or such */
47 	IMSG_GET_RAW,		/* get but with an explicit req str */
48 	IMSG_ERR,
49 	IMSG_CHECK_CERT,
50 	IMSG_CERT_STATUS,
51 	IMSG_GOT_CODE,
52 	IMSG_GOT_META,
53 	IMSG_PROCEED,
54 	IMSG_STOP,
55 	IMSG_BUF,
56 	IMSG_EOF,
57 	IMSG_QUIT,
58 
59 	/* ui <-> fs */
60 	IMSG_INIT,
61 	IMSG_TOFU,
62 	IMSG_BOOKMARK_PAGE,
63 	IMSG_BOOKMARK_OK,
64 	IMSG_SAVE_CERT,
65 	IMSG_SAVE_CERT_OK,
66 	IMSG_UPDATE_CERT,
67 	IMSG_UPDATE_CERT_OK,
68 
69 	IMSG_FILE_OPEN,
70 	IMSG_FILE_OPENED,
71 
72 	IMSG_SESSION_START,
73 	IMSG_SESSION_TAB,
74 	IMSG_SESSION_TAB_HIST,
75 	IMSG_SESSION_END,
76 };
77 
78 enum line_type {
79 	/* text/gemini */
80 	LINE_TEXT,
81 	LINE_LINK,
82 	LINE_TITLE_1,
83 	LINE_TITLE_2,
84 	LINE_TITLE_3,
85 	LINE_ITEM,
86 	LINE_QUOTE,
87 	LINE_PRE_START,
88 	LINE_PRE_CONTENT,
89 	LINE_PRE_END,
90 
91 	/* text/x-patch */
92 	LINE_PATCH,
93 	LINE_PATCH_HDR,
94 	LINE_PATCH_HUNK_HDR,
95 	LINE_PATCH_ADD,
96 	LINE_PATCH_DEL,
97 
98 	/* minibuffer */
99 	LINE_COMPL,
100 	LINE_COMPL_CURRENT,
101 
102 	/* help */
103 	LINE_HELP,
104 
105 	/* download */
106 	LINE_DOWNLOAD,
107 	LINE_DOWNLOAD_DONE,
108 	LINE_DOWNLOAD_INFO,
109 
110 	/* misc ui */
111 	LINE_FRINGE,
112 };
113 
114 /* for lines: mark as hidden */
115 #define L_HIDDEN	1
116 
117 /* for vlines: mark as continuation */
118 #define L_CONTINUATION	2
119 
120 struct line {
121 	enum line_type		 type;
122 	char			*line;
123 	char			*alt;
124 	void			*data;
125 	int			 flags;
126 	TAILQ_ENTRY(line)	 lines;
127 };
128 
129 struct vline {
130 	struct line		*parent;
131 	char			*line;
132 	int			 flags;
133 	TAILQ_ENTRY(vline)	 vlines;
134 };
135 
136 struct parser;
137 
138 typedef int	(*parsechunkfn)(struct parser*, const char*, size_t);
139 typedef int	(*parserfreefn)(struct parser*);
140 
141 typedef void (imsg_handlerfn)(struct imsg*, size_t);
142 
143 struct parser {
144 	const char	*name;
145 	char		 title[128+1];
146 	char		*buf;
147 	size_t		 len;
148 	size_t		 cap;
149 
150 #define PARSER_IN_BODY	1
151 #define PARSER_IN_PRE	2
152 #define PARSER_IN_PATCH_HDR 4
153 	int		 flags;
154 	parsechunkfn	 parse;
155 	parserfreefn	 free;
156 
157 	TAILQ_HEAD(, line)	 head;
158 };
159 
160 /*
161  * differnt types of trust for a certificate.  Following
162  * gemini://thfr.info/gemini/modified-trust-verify.gmi
163  */
164 enum trust_state {
165 	TS_UNKNOWN,
166 	TS_UNTRUSTED,
167 	TS_TEMP_TRUSTED,
168 	TS_TRUSTED,
169 	TS_VERIFIED,
170 };
171 
172 struct tofu_entry {
173 	char	domain[GEMINI_URL_LEN];
174 
175 	/*
176 	 * enough space for ``PROTO:HASH''.  probably isn't a good
177 	 * idea tho.
178 	 */
179 	char	hash[128+1];
180 	int	verified;
181 };
182 
183 struct histhead {
184 	TAILQ_HEAD(mhisthead, hist)	head;
185 	size_t				len;
186 };
187 struct hist {
188 	char			h[1025];
189 	TAILQ_ENTRY(hist)	entries;
190 };
191 
192 struct buffer {
193 	struct parser		 page;
194 
195 	size_t			 last_line_off;
196 	int			 force_redraw;
197 
198 	int			 curs_x;
199 	int			 curs_y;
200 	size_t			 line_off;
201 	size_t			 line_max;
202 	struct vline		*top_line;
203 	struct vline		*current_line;
204 	size_t			 cpoff;
205 	TAILQ_HEAD(vhead, vline) head;
206 };
207 
208 #define TAB_CURRENT	0x1	/* only for save_session */
209 #define TAB_KILLED	0x2	/* only for save_session */
210 #define TAB_URGENT	0x4
211 #define TAB_LAZY	0x8	/* to lazy load tabs */
212 
213 #define NEW_TAB_URL	"about:new"
214 
215 TAILQ_HEAD(tabshead, tab);
216 extern struct tabshead tabshead;
217 extern struct tabshead ktabshead;
218 struct tab {
219 	TAILQ_ENTRY(tab)	 tabs;
220 	uint32_t		 id;
221 	uint32_t		 flags;
222 
223 	char			*cert;
224 	enum trust_state	 trust;
225 	struct proxy		*proxy;
226 	struct phos_uri		 uri;
227 	struct histhead		 hist;
228 	struct hist		*hist_cur;
229 	size_t			 hist_off;
230 
231 	int			 code;
232 	char			 meta[GEMINI_URL_LEN];
233 	int			 redirect_count;
234 
235 	struct buffer		 buffer;
236 
237 	short			 loading_anim;
238 	short			 loading_anim_step;
239 	struct event		 loadingev;
240 };
241 
242 extern TAILQ_HEAD(proxylist, proxy) proxies;
243 struct proxy {
244 	char	*match_proto;
245 
246 	char	*host;
247 	char	*port;
248 	int	 proto;
249 
250 	TAILQ_ENTRY(proxy) proxies;
251 };
252 
253 enum {
254 	PROTO_FINGER,
255 	PROTO_GEMINI,
256 	PROTO_GOPHER,
257 	/* ... */
258 };
259 
260 struct get_req {
261 	int		proto;
262 	char		host[254];
263 	char		port[16];
264 	char		req[1027];
265 };
266 
267 struct cmd {
268 	const char	*cmd;
269 	void		(*fn)(struct buffer *);
270 	const char	*descr;
271 };
272 extern struct cmd cmds[];
273 
274 /* defaults.c */
275 void		 config_init(void);
276 int		 config_setprfx(const char *, const char *, const char *);
277 int		 config_setvari(const char *, int);
278 int		 config_setvars(const char *, char *);
279 int		 config_setcolor(int, const char *, int, int, int);
280 int		 config_setattr(const char *, int, int, int);
281 void		 config_apply_style(void);
282 
283 /* downloads.c */
284 extern STAILQ_HEAD(downloads, download) downloads;
285 struct download {
286 	uint32_t		 id;
287 	int			 fd;
288 	size_t			 bytes;
289 	char			*path;
290 	STAILQ_ENTRY(download)	 entries;
291 };
292 
293 void		 recompute_downloads(void);
294 void		 enqueue_download(uint32_t, const char *);
295 struct download	*download_by_id(uint32_t);
296 
297 /* help.c */
298 void		 recompute_help(void);
299 
300 /* hist.c */
301 void		 hist_clear(struct histhead *);
302 void		 hist_clear_forward(struct histhead*, struct hist*);
303 void		 hist_push(struct histhead*, struct hist*);
304 void		 hist_add_before(struct histhead *, struct hist *, struct hist *);
305 struct hist	*hist_pop(struct histhead *);
306 
307 /* mime.c */
308 int		 setup_parser_for(struct tab*);
309 
310 /* net.c */
311 int		 net_main(void);
312 
313 /* parse.y */
314 void		 parseconfig(const char *, int);
315 
316 /* sandbox.c */
317 void		 sandbox_net_process(void);
318 void		 sandbox_ui_process(void);
319 void		 sandbox_fs_process(void);
320 
321 /* telescope.c */
322 extern int operating;
323 extern int safe_mode;
324 
325 #define LU_MODE_NONE	0x0
326 #define LU_MODE_NOHIST	0x1
327 #define LU_MODE_NOCACHE	0x2
328 
329 void		 gopher_send_search_req(struct tab *, const char *);
330 void		 load_url(struct tab *, const char *, const char *, int);
331 void		 load_url_in_tab(struct tab *, const char *, const char *, int);
332 int		 load_previous_page(struct tab*);
333 int		 load_next_page(struct tab*);
334 void		 add_to_bookmarks(const char*);
335 void		 humanify_url(const char *, char *, size_t);
336 int		 ui_send_net(int, uint32_t, const void *, uint16_t);
337 int		 ui_send_fs(int, uint32_t, const void *, uint16_t);
338 
339 /* tofu.c */
340 void			 tofu_init(struct ohash*, unsigned int, ptrdiff_t);
341 struct tofu_entry	*tofu_lookup(struct ohash*, const char*, const char*);
342 void			 tofu_add(struct ohash*, struct tofu_entry*);
343 void			 tofu_update(struct ohash*, struct tofu_entry*);
344 void			 tofu_temp_trust(struct ohash *, const char *, const char *, const char *);
345 
346 /* util.c */
347 
348 /* wrap.c */
349 void		 erase_buffer(struct buffer *);
350 void		 empty_linelist(struct buffer*);
351 void		 empty_vlist(struct buffer*);
352 int		 wrap_one(struct buffer *, const char *, struct line *, size_t);
353 int		 wrap_text(struct buffer*, const char*, struct line*, size_t);
354 int		 hardwrap_text(struct buffer*, struct line*, size_t);
355 int		 wrap_page(struct buffer *, int width);
356 
357 #endif /* TELESCOPE_H */