nginx中判断输入ip是否和配置ip在同一个网段

根据input_ip & net_mask == seted_ip & net_mask 来判断。

详见代码：

 1 typedef struct {
 2     ngx_uint_t         ip[4];
 3     ngx_uint_t         mask[4];
 4 } ngx_stream_eth_netSegment_t;
 5 
 6 
 7 typedef struct {
 8     ngx_array_t            eths; // ngx_streams_eth_srv_conf_t
 9 } ngx_streams_eth_main_conf_t;
10 
11 
12 typedef struct {
13     ngx_str_t         ethname;
14     ngx_array_t     netSegments; // ngx_stream_eth_netSegment_t
15 } ngx_streams_eth_srv_conf_t ;

 

 1 static ngx_int_t 
 2 ngx_streams_eth_ip_atoi(ngx_str_t *ip, ngx_uint_t iparr[]) 
 3 {
 4     int          i=0, j;
 5     u_char         *p, tmp[4]={0};
 6     int         cnt=0;
 7     ngx_int_t     len;
 8     
 9     p = ip->data;
10     len = ip->len;
11 
12     for (j=0; j < len; j++) {
13         if (*p == '.' || j == len - 1) { 
14             if (j == len -1) {
15                 tmp[cnt++] = *p;
16             }
17             iparr[i++] = ngx_atoi(tmp, cnt);
18             ngx_memset(tmp, 0, sizeof(tmp));
19             cnt = 0;
20             p++;
21             continue;
22         }
23         tmp[cnt++] = *p++;
24         if (cnt > 3) {
25             return NGX_ERROR;
26         }
27     }
28 
29     
30     return NGX_OK;
31 }
32 
33 
34 static ngx_int_t 
35 ngx_streams_eth_is_same_net(ngx_str_t *ip, ngx_stream_eth_netSegment_t *netSegment) 
36 {
37     ngx_uint_t iparr[4]={0};
38     ngx_int_t i;
39     if (ngx_streams_eth_ip_atoi(ip, iparr) != NGX_OK) {
40         return NGX_ERROR;
41     }
42 
43     for (i=0; i<4; i++) {
44         if ((iparr[i] & netSegment->mask[i]) != 
45             (netSegment->ip[i] & netSegment->mask[i]) )  {
46             return NGX_ERROR;
47         }
48     }
49     return NGX_OK;    
50 }
51 
52 
53 ngx_stream_eth_netSegment_t * 
54 ngx_streams_eth_match(ngx_str_t *ip) {
55     ngx_streams_eth_main_conf_t      *smcf;
56     ngx_int_t                         i, j;
57     ngx_streams_eth_srv_conf_t       *sscf;
58     ngx_stream_eth_netSegment_t        *netSegment;
59     
60     smcf = ngx_streams_cycle_get_module_main_conf(ngx_cycle, ngx_streams_eth_module);
61     for (i = 0; i < smcf->eths.nelts; i++) {
62         sscf = ngx_array_pop(&smcf->eths, i);
63         if (sscf == NULL) {
64             goto failed;
65         }
66         for (j = 0; j < sscf->netSegments.nelts; j++) {
67             netSegment = ngx_array_pop(&sscf->netSegments, j);
68             if (ngx_streams_eth_is_same_net(ip, netSegment) == NGX_OK) {
69                 return netSegment;
70             }
71         }
72     }
73 
74 failed:
75     return NULL;
76 }