1 #include "first.h"
2
3 #include "sock_addr_cache.h"
4
5 #include "sys-socket.h"
6 #include <string.h>
7
8 #include "buffer.h"
9 #include "sock_addr.h"
10
11
sock_addr_cache_inet_ntop_copy_buffer(buffer * const restrict b,const sock_addr * const restrict saddr)12 int sock_addr_cache_inet_ntop_copy_buffer(buffer * const restrict b, const sock_addr * const restrict saddr)
13 {
14 #define NTOP_CACHE_MAX 4
15 static int ndx4;
16 static struct { struct in_addr ipv4; } ntop4_cache[NTOP_CACHE_MAX];
17 static struct { char s[INET_ADDRSTRLEN+1]; } ntop4_strs[NTOP_CACHE_MAX];
18 #ifdef HAVE_IPV6
19 static int ndx6;
20 static struct { struct in6_addr ipv6; } ntop6_cache[NTOP_CACHE_MAX];
21 static struct { char s[INET6_ADDRSTRLEN+1]; } ntop6_strs[NTOP_CACHE_MAX];
22 #endif
23 switch (saddr->plain.sa_family) {
24 case AF_INET:
25 for (int i = 0; i < NTOP_CACHE_MAX; ++i) {
26 if (ntop4_cache[i].ipv4.s_addr == saddr->ipv4.sin_addr.s_addr) {
27 buffer_copy_string(b, ntop4_strs[i].s);
28 return 0;
29 }
30 }
31 break;
32 #ifdef HAVE_IPV6
33 case AF_INET6:
34 for (int i = 0; i < NTOP_CACHE_MAX; ++i) {
35 if (0 == memcmp(ntop6_cache[i].ipv6.s6_addr,
36 saddr->ipv6.sin6_addr.s6_addr, 16)) {
37 buffer_copy_string(b, ntop6_strs[i].s);
38 return 0;
39 }
40 }
41 break;
42 #endif
43 default:
44 break;
45 }
46
47 if (0 != sock_addr_inet_ntop_copy_buffer(b, saddr)) {
48 buffer_blank(b);
49 return -1;
50 }
51
52 switch (saddr->plain.sa_family) {
53 case AF_INET:
54 ntop4_cache[ndx4].ipv4.s_addr = saddr->ipv4.sin_addr.s_addr;
55 memcpy(ntop4_strs+ndx4, b->ptr, buffer_clen(b)+1);
56 if (++ndx4 == NTOP_CACHE_MAX) ndx4 = 0;
57 break;
58 #ifdef HAVE_IPV6
59 case AF_INET6:
60 memcpy(ntop6_cache[ndx6].ipv6.s6_addr,saddr->ipv6.sin6_addr.s6_addr,16);
61 memcpy(ntop6_strs+ndx6, b->ptr, buffer_clen(b)+1);
62 if (++ndx6 == NTOP_CACHE_MAX) ndx6 = 0;
63 break;
64 #endif
65 default:
66 break;
67 }
68 return 0;
69 }
70