2 75a8a1ec 2022-02-08 op * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
4 75a8a1ec 2022-02-08 op * Permission to use, copy, modify, and distribute this software for any
5 75a8a1ec 2022-02-08 op * purpose with or without fee is hereby granted, provided that the above
6 75a8a1ec 2022-02-08 op * copyright notice and this permission notice appear in all copies.
8 75a8a1ec 2022-02-08 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 75a8a1ec 2022-02-08 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 75a8a1ec 2022-02-08 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 75a8a1ec 2022-02-08 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 75a8a1ec 2022-02-08 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 75a8a1ec 2022-02-08 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 75a8a1ec 2022-02-08 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 75a8a1ec 2022-02-08 op #include "compat.h"
19 75a8a1ec 2022-02-08 op #include <stdio.h>
20 75a8a1ec 2022-02-08 op #include <stdlib.h>
21 75a8a1ec 2022-02-08 op #include <string.h>
23 75a8a1ec 2022-02-08 op #include "parser.h"
24 75a8a1ec 2022-02-08 op #include "utils.h"
26 75a8a1ec 2022-02-08 op #define evap evbuffer_add_printf
28 75a8a1ec 2022-02-08 op struct gm_selector {
30 75a8a1ec 2022-02-08 op const char *ds;
31 75a8a1ec 2022-02-08 op const char *selector;
32 75a8a1ec 2022-02-08 op const char *addr;
33 75a8a1ec 2022-02-08 op const char *port;
36 75a8a1ec 2022-02-08 op static void gm_parse_selector(char *, struct gm_selector *);
38 75a8a1ec 2022-02-08 op static int gm_parse(struct parser *, const char *, size_t);
39 75a8a1ec 2022-02-08 op static int gm_foreach_line(struct parser *, const char *, size_t);
40 75a8a1ec 2022-02-08 op static int gm_free(struct parser *);
41 75a8a1ec 2022-02-08 op static int gm_serialize(struct parser *, struct evbuffer *);
44 75a8a1ec 2022-02-08 op gophermap_initparser(struct parser *p)
46 75a8a1ec 2022-02-08 op memset(p, 0, sizeof(*p));
48 75a8a1ec 2022-02-08 op p->name = "gophermap";
49 75a8a1ec 2022-02-08 op p->parse = &gm_parse;
50 75a8a1ec 2022-02-08 op p->free = &gm_free;
51 75a8a1ec 2022-02-08 op p->serialize = &gm_serialize;
53 75a8a1ec 2022-02-08 op TAILQ_INIT(&p->head);
57 75a8a1ec 2022-02-08 op gm_parse_selector(char *line, struct gm_selector *s)
59 75a8a1ec 2022-02-08 op s->type = *line++;
61 75a8a1ec 2022-02-08 op s->selector = "";
65 75a8a1ec 2022-02-08 op if ((line = strchr(line, '\t')) == NULL)
67 75a8a1ec 2022-02-08 op *line++ = '\0';
68 75a8a1ec 2022-02-08 op s->selector = line;
70 75a8a1ec 2022-02-08 op if ((line = strchr(line, '\t')) == NULL)
72 75a8a1ec 2022-02-08 op *line++ = '\0';
73 75a8a1ec 2022-02-08 op s->addr = line;
75 75a8a1ec 2022-02-08 op if ((line = strchr(line, '\t')) == NULL)
77 75a8a1ec 2022-02-08 op *line++ = '\0';
78 75a8a1ec 2022-02-08 op s->port = line;
82 75a8a1ec 2022-02-08 op gm_parse(struct parser *p, const char *buf, size_t size)
84 75a8a1ec 2022-02-08 op return parser_foreach_line(p, buf, size, gm_foreach_line);
87 75a8a1ec 2022-02-08 op static inline int
88 75a8a1ec 2022-02-08 op emit_line(struct parser *p, enum line_type type, struct gm_selector *s)
90 75a8a1ec 2022-02-08 op struct line *l;
91 75a8a1ec 2022-02-08 op char buf[LINE_MAX], b[2] = {0};
93 75a8a1ec 2022-02-08 op if ((l = calloc(1, sizeof(*l))) == NULL)
96 75a8a1ec 2022-02-08 op if ((l->line = strdup(s->ds)) == NULL)
99 75a8a1ec 2022-02-08 op switch (l->type = type) {
100 75a8a1ec 2022-02-08 op case LINE_LINK:
101 75a8a1ec 2022-02-08 op if (s->type == 'h' && has_prefix(s->selector, "URL:")) {
102 75a8a1ec 2022-02-08 op strlcpy(buf, s->selector+4, sizeof(buf));
104 75a8a1ec 2022-02-08 op strlcpy(buf, "gopher://", sizeof(buf));
105 75a8a1ec 2022-02-08 op strlcat(buf, s->addr, sizeof(buf));
106 75a8a1ec 2022-02-08 op strlcat(buf, ":", sizeof(buf));
107 75a8a1ec 2022-02-08 op strlcat(buf, s->port, sizeof(buf));
108 75a8a1ec 2022-02-08 op strlcat(buf, "/", sizeof(buf));
109 75a8a1ec 2022-02-08 op b[0] = s->type;
110 75a8a1ec 2022-02-08 op strlcat(buf, b, sizeof(buf));
111 75a8a1ec 2022-02-08 op if (*s->selector != '/')
112 75a8a1ec 2022-02-08 op strlcat(buf, "/", sizeof(buf));
113 75a8a1ec 2022-02-08 op strlcat(buf, s->selector, sizeof(buf));
116 75a8a1ec 2022-02-08 op if ((l->alt = strdup(buf)) == NULL)
124 75a8a1ec 2022-02-08 op TAILQ_INSERT_TAIL(&p->head, l, lines);
129 75a8a1ec 2022-02-08 op if (l != NULL) {
130 75a8a1ec 2022-02-08 op free(l->line);
131 75a8a1ec 2022-02-08 op free(l->alt);
138 75a8a1ec 2022-02-08 op gm_foreach_line(struct parser *p, const char *line, size_t linelen)
140 75a8a1ec 2022-02-08 op char buf[LINE_MAX] = {0};
141 75a8a1ec 2022-02-08 op struct gm_selector s = {0};
143 75a8a1ec 2022-02-08 op memcpy(buf, line, MIN(sizeof(buf)-1, linelen));
144 75a8a1ec 2022-02-08 op gm_parse_selector(buf, &s);
146 75a8a1ec 2022-02-08 op switch (s.type) {
147 75a8a1ec 2022-02-08 op case '0': /* text file */
148 75a8a1ec 2022-02-08 op case '1': /* gopher submenu */
149 75a8a1ec 2022-02-08 op case '2': /* CCSO nameserver */
150 75a8a1ec 2022-02-08 op case '4': /* binhex-encoded file */
151 75a8a1ec 2022-02-08 op case '5': /* DOS file */
152 75a8a1ec 2022-02-08 op case '6': /* uuencoded file */
153 75a8a1ec 2022-02-08 op case '7': /* full-text search */
154 75a8a1ec 2022-02-08 op case '8': /* telnet */
155 75a8a1ec 2022-02-08 op case '9': /* binary file */
156 75a8a1ec 2022-02-08 op case '+': /* mirror or alternate server */
157 75a8a1ec 2022-02-08 op case 'g': /* gif */
158 75a8a1ec 2022-02-08 op case 'I': /* image */
159 75a8a1ec 2022-02-08 op case 'T': /* telnet 3270 */
160 75a8a1ec 2022-02-08 op case ':': /* gopher+: bitmap image */
161 75a8a1ec 2022-02-08 op case ';': /* gopher+: movie file */
162 75a8a1ec 2022-02-08 op case 'd': /* non-canonical: doc */
163 75a8a1ec 2022-02-08 op case 'h': /* non-canonical: html file */
164 75a8a1ec 2022-02-08 op case 's': /* non-canonical: sound file */
165 75a8a1ec 2022-02-08 op if (!emit_line(p, LINE_LINK, &s))
171 75a8a1ec 2022-02-08 op case 'i': /* non-canonical: message */
172 75a8a1ec 2022-02-08 op if (!emit_line(p, LINE_TEXT, &s))
176 75a8a1ec 2022-02-08 op case '3': /* error code */
177 75a8a1ec 2022-02-08 op if (!emit_line(p, LINE_QUOTE, &s))
186 75a8a1ec 2022-02-08 op gm_free(struct parser *p)
188 75a8a1ec 2022-02-08 op /* flush the buffer */
189 75a8a1ec 2022-02-08 op if (p->len != 0)
190 75a8a1ec 2022-02-08 op gm_foreach_line(p, p->buf, p->len);
192 75a8a1ec 2022-02-08 op free(p->buf);
197 75a8a1ec 2022-02-08 op static inline const char *
198 75a8a1ec 2022-02-08 op gopher_skip_selector(const char *path, int *ret_type)
200 75a8a1ec 2022-02-08 op *ret_type = 0;
202 75a8a1ec 2022-02-08 op if (!strcmp(path, "/") || *path == '\0') {
203 75a8a1ec 2022-02-08 op *ret_type = '1';
207 75a8a1ec 2022-02-08 op if (*path != '/')
211 75a8a1ec 2022-02-08 op switch (*ret_type = *path) {
218 75a8a1ec 2022-02-08 op *ret_type = 0;
223 75a8a1ec 2022-02-08 op return ++path;
227 75a8a1ec 2022-02-08 op serialize_link(struct line *line, const char *text, struct evbuffer *evb)
229 75a8a1ec 2022-02-08 op size_t portlen = 0;
231 75a8a1ec 2022-02-08 op const char *uri, *endhost, *port, *path, *colon;
233 75a8a1ec 2022-02-08 op if ((uri = line->alt) == NULL)
236 75a8a1ec 2022-02-08 op if (!has_prefix(uri, "gopher://"))
237 75a8a1ec 2022-02-08 op return evap(evb, "h%s\tURL:%s\terror.host\t1\n",
238 75a8a1ec 2022-02-08 op text, line->alt);
240 75a8a1ec 2022-02-08 op uri += 9; /* skip gopher:// */
242 75a8a1ec 2022-02-08 op path = strchr(uri, '/');
243 75a8a1ec 2022-02-08 op colon = strchr(uri, ':');
245 75a8a1ec 2022-02-08 op if (path != NULL && colon > path)
246 75a8a1ec 2022-02-08 op colon = NULL;
248 75a8a1ec 2022-02-08 op if ((endhost = colon) == NULL &&
249 75a8a1ec 2022-02-08 op (endhost = path) == NULL)
250 75a8a1ec 2022-02-08 op endhost = strchr(path, '\0');
252 75a8a1ec 2022-02-08 op if (colon != NULL) {
253 75a8a1ec 2022-02-08 op for (port = colon+1; *port && *port != '/'; ++port)
255 75a8a1ec 2022-02-08 op port = colon+1;
261 75a8a1ec 2022-02-08 op if (path == NULL) {
265 75a8a1ec 2022-02-08 op path = gopher_skip_selector(path, &type);
267 75a8a1ec 2022-02-08 op return evap(evb, "%c%s\t%s\t%.*s\t%.*s\n", type, text,
268 75a8a1ec 2022-02-08 op path, (int)(endhost - uri), uri, (int)portlen, port);
272 75a8a1ec 2022-02-08 op gm_serialize(struct parser *p, struct evbuffer *evb)
274 75a8a1ec 2022-02-08 op struct line *line;
275 75a8a1ec 2022-02-08 op const char *text;
278 75a8a1ec 2022-02-08 op TAILQ_FOREACH(line, &p->head, lines) {
279 75a8a1ec 2022-02-08 op if ((text = line->line) == NULL)
282 75a8a1ec 2022-02-08 op switch (line->type) {
283 75a8a1ec 2022-02-08 op case LINE_LINK:
284 75a8a1ec 2022-02-08 op r = serialize_link(line, text, evb);
287 75a8a1ec 2022-02-08 op case LINE_TEXT:
288 75a8a1ec 2022-02-08 op r = evap(evb, "i%s\t\terror.host\t1\n",
292 75a8a1ec 2022-02-08 op case LINE_QUOTE:
293 75a8a1ec 2022-02-08 op r = evap(evb, "3%s\t\terror.host\t1\n",
298 75a8a1ec 2022-02-08 op /* unreachable */