1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <curl/curl.h>
#include <err.h>
#include <regex.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sysexits.h>
static regex_t regex(const char *pattern) {
regex_t regex;
int error = regcomp(®ex, pattern, REG_EXTENDED);
if (!error) return regex;
char buf[256];
regerror(error, ®ex, buf, sizeof(buf));
errx(EX_SOFTWARE, "regcomp: %s: %s", buf, pattern);
}
static CURL *curl;
static bool html;
static struct {
char buf[8192];
size_t len;
} body;
static size_t handleHeader(char *buf, size_t size, size_t nitems, void *user) {
(void)user;
size_t len = size * nitems;
const char ContentType[] = "Content-Type: text/html";
if (sizeof(ContentType) - 1 < len) len = sizeof(ContentType) - 1;
if (!strncasecmp(buf, ContentType, len)) html = true;
return size * nitems;
}
static size_t handleBody(char *buf, size_t size, size_t nitems, void *user) {
(void)user;
size_t len = size * nitems;
size_t cap = sizeof(body.buf) - body.len;
size_t cpy = (len < cap ? len : cap);
memcpy(&body.buf[body.len], buf, cpy);
body.len += cpy;
return len;
}
static const char *TitlePattern = "<title>([^<]*)</title>";
static regex_t TitleRegex;
static bool getTitle(const char *url) {
CURLcode code = curl_easy_setopt(curl, CURLOPT_URL, url);
if (code) {
warnx("CURLOPT_URL: %s", curl_easy_strerror(code));
return false;
}
html = false;
curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);
if ((code = curl_easy_perform(curl))) {
warnx("curl_easy_perform: %s", curl_easy_strerror(code));
return false;
}
if (!html) return false;
body.len = 0;
curl_easy_setopt(curl, CURLOPT_NOBODY, 0L);
if ((code = curl_easy_perform(curl))) {
warnx("curl_easy_perform: %s", curl_easy_strerror(code));
return false;
}
body.buf[body.len - 1] = '\0';
regmatch_t match[2];
int error = regexec(&TitleRegex, body.buf, 2, match, 0);
if (error == REG_NOMATCH) return false;
if (error) errx(EX_SOFTWARE, "regexec: %d", error);
body.buf[match[1].rm_eo] = '\0';
char *title = &body.buf[match[1].rm_so];
printf("%s\n", title);
return true;
}
int main(int argc, char *argv[]) {
TitleRegex = regex(TitlePattern);
CURLcode code = curl_global_init(CURL_GLOBAL_ALL);
if (code) errx(EX_OSERR, "curl_global_init: %s", curl_easy_strerror(code));
curl = curl_easy_init();
if (!curl) errx(EX_SOFTWARE, "curl_easy_init");
curl_easy_setopt(curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 5L);
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, handleHeader);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, handleBody);
setlinebuf(stdout);
if (argc > 1) {
return (getTitle(argv[1]) ? EX_OK : EX_DATAERR);
}
regex_t urlRegex = regex("https?://[^[:space:]>\"]+");
char *buf = NULL;
size_t cap = 0;
while (0 < getline(&buf, &cap, stdin)) {
regmatch_t match = {0};
for (char *url = buf; *url; url += match.rm_eo) {
int error = regexec(&urlRegex, url, 1, &match, 0);
if (error == REG_NOMATCH) break;
if (error) errx(EX_SOFTWARE, "regexec: %d", error);
url[match.rm_eo] = '\0';
getTitle(&url[match.rm_so]);
url[match.rm_eo] = ' ';
}
}
}
|