├── LICENSE
├── README.md
└── cnips.c


/LICENSE:
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 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2013 greensea
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy of
 6 | this software and associated documentation files (the "Software"), to deal in
 7 | the Software without restriction, including without limitation the rights to
 8 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 9 | the Software, and to permit persons to whom the Software is furnished to do so,
10 | subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
17 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
18 | COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
19 | IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 | 


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/README.md:
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 1 | cnips
 2 | =====
 3 | 
 4 | 获取中国的 IP 地址范围
 5 | 
 6 | 用法
 7 | ===
 8 | 
 9 | ```
10 | gcc cnips.c -O2 -o cnips
11 | 
12 | wget http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest
13 | cat delegated-apnic-latest | ./cnips
14 | 
15 | ```
16 | 
17 | 配合 iproute2 来设置路由表
18 | ===
19 | 
20 | ```
21 | for net in `cat delegated-apnic-latest | ./cnips`
22 | do
23 |   ip route add $net via <your_gateway> table <your_rule_table>
24 | done
25 | ```
26 | 


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/cnips.c:
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 1 | /**
 2 |  * License: MIT License
 3 |  * 
 4 |  * greensea <gs@bbxy.net>
 5 |  */
 6 | 
 7 | #include <stdio.h>
 8 | #include <stdint.h>
 9 | #include <string.h>
10 | #include <stdlib.h>
11 | 
12 | 
13 | unsigned int hostnum2subnet(uint32_t num) {
14 |     unsigned int ret = 32;
15 |     
16 |     while (num != 1) {
17 |         num >>= 1;
18 |         ret--;
19 |     }
20 |     
21 |     
22 |     return ret;
23 | }
24 | 
25 | void parse_line(char* line) {
26 |     char* ip;
27 |     char *numstr;
28 |     int num;
29 |     
30 |     /// 过滤出中国的地址
31 |     if (strstr(line, "CN") == NULL) {
32 |         return;
33 |     }
34 |     if (strstr(line, "ipv4") == NULL) {
35 |         return;
36 |     }
37 |     
38 |     /// 提取 IP 地址和主机数量
39 |     strtok(line, "|");
40 |     strtok(NULL, "|");
41 |     strtok(NULL, "|");
42 |     
43 |     ip = strtok(NULL, "|");
44 |     numstr = strtok(NULL, "|");
45 |     
46 |     /// 输出网段
47 |     num = atoi(numstr);
48 |     printf("%s/%d\n", ip, hostnum2subnet(num));
49 | }
50 | 
51 | int main(int argc, char* argv[]) {
52 |     char* line;
53 |     size_t linesize;
54 |     
55 | 
56 |     while (getline(&line, &linesize, stdin) != -1) {
57 |         parse_line(line);
58 |     }
59 |     
60 |     return 0;
61 | }
62 | 


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