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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*
* (c) Vincenzo "KatolaZ" Nicosia 2017 -- <katolaz@freaknet.org>
*
*
* This file is part of "binnit", a minimal no-fuss pastebin-like
* server written in golang
*
*/
package main
import (
"crypto/sha256"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"path/filepath"
"time"
"io"
)
var p_conf = Config{
server_name: "localhost",
bind_addr: "0.0.0.0",
bind_port: "8000",
paste_dir: "./pastes",
templ_dir: "./tmpl",
log_fname: "./binnit.log",
max_size: 4096,
}
func min (a, b int) int {
if a > b {
return b
} else {
return a
}
}
func handle_get_paste(w http.ResponseWriter, r *http.Request) {
var paste_name, orig_name string
var err error
orig_name = filepath.Clean(r.URL.Path)
paste_name = p_conf.paste_dir + "/" + orig_name
orig_IP := r.RemoteAddr
log.Printf("Received GET from %s for '%s'\n", orig_IP, orig_name)
// The default is to serve index.html
if (orig_name == "/") || (orig_name == "/index.html") {
http.ServeFile(w, r, p_conf.templ_dir + "/index.html")
} else {
// otherwise, if the requested paste exists, we serve it...
if _, err = os.Stat(paste_name); err == nil && orig_name != "./" {
//http.ServeFile(w, r, paste_name)
s, err := prepare_paste_page(&p_conf, orig_name)
if err == nil {
fmt.Fprintf(w, "%s", s)
return
} else {
fmt.Fprintf(w, "Error recovering paste '%s'\n", orig_name)
return
}
} else {
// otherwise, we give say we didn't find it
fmt.Fprintf(w, "Paste '%s' not found\n", orig_name)
return
}
}
}
func handle_put_paste(w http.ResponseWriter, r *http.Request) {
if err := r.ParseForm(); err != nil {
// Invalid POST -- let's serve the default file
http.ServeFile(w, r, p_conf.templ_dir + "/index.html")
} else {
h := sha256.New()
req_body := r.PostForm
orig_IP := r.RemoteAddr
log.Printf("Received new POST from %s\n", orig_IP)
// get title, body, and time
title := req_body.Get("title")
paste := req_body.Get("paste")
now := time.Now().String()
// format content
paste = paste[0:min(len(paste), int(p_conf.max_size))]
content := fmt.Sprintf("# Title: %s\n# Pasted: %s\n------------\n%s", title, now, paste)
// ccompute the sha256 hash using title, body, and time
h.Write([]byte(content))
paste_hash := fmt.Sprintf("%x", h.Sum(nil))
log.Printf(" `-- hash: %s\n", paste_hash)
paste_dir := p_conf.paste_dir + "/"
// Now we save the file
for i := 0; i < len(paste_hash)-16; i++ {
paste_name := paste_hash[i:i+16]
if _, err := os.Stat(paste_dir + paste_name); os.IsNotExist(err) {
// The file does not exist, so we can create it
if err := ioutil.WriteFile(paste_dir+ paste_name, []byte(content), 0644); err == nil {
// and then we return the URL:
log.Printf(" `-- saving paste to : %s", paste_dir + paste_name)
//hostname := r.Host
hostname := p_conf.server_name
if show := req_body.Get("show"); show != "1" {
fmt.Fprintf(w, "%s/%s", hostname, paste_name)
return
} else{
fmt.Fprintf(w, "<html><body>Link: <a href='http://%s/%s'>http://%s/%s</a></body></html>",
hostname, paste_hash[i:i+16], hostname, paste_hash[i:i+16])
return
}
} else {
fmt.Fprintf(w, "Cannot create the paste.. Sorry!\n")
return
}
}
}
}
}
func req_handler(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case "GET":
handle_get_paste(w, r)
case "POST":
handle_put_paste(w, r)
default:
http.NotFound(w, r)
}
}
func main() {
parse_config("binnit.cfg", &p_conf)
f, err := os.OpenFile(p_conf.log_fname, os.O_APPEND | os.O_CREATE | os.O_RDWR, 0600)
if err != nil {
fmt.Fprintf(os.Stderr, "Error opening logfile: %s. Exiting\n", p_conf.log_fname)
os.Exit(1)
}
defer f.Close()
log.SetOutput(io.Writer(f))
log.SetPrefix("[binnit]: ")
log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds)
log.Println("Binnit version 0.1 -- Starting ")
log.Printf(" + Serving pastes on: %s\n", p_conf.server_name)
log.Printf(" + listening on: %s:%s\n", p_conf.bind_addr, p_conf.bind_port )
log.Printf(" + paste_dir: %s\n", p_conf.paste_dir)
log.Printf(" + templ_dir: %s\n", p_conf.templ_dir)
log.Printf(" + max_size: %d\n", p_conf.max_size)
http.HandleFunc("/", req_handler)
log.Fatal(http.ListenAndServe(p_conf.bind_addr + ":" + p_conf.bind_port, nil))
}
|
