70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
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#include "first.h"
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#include "sock_addr_cache.h"
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#include "sys-socket.h"
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#include <string.h>
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#include "buffer.h"
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#include "sock_addr.h"
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int sock_addr_cache_inet_ntop_copy_buffer(buffer * const restrict b, const sock_addr * const restrict saddr)
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{
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#define NTOP_CACHE_MAX 4
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static int ndx4;
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static struct { struct in_addr ipv4; } ntop4_cache[NTOP_CACHE_MAX];
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static struct { char s[INET_ADDRSTRLEN+1]; } ntop4_strs[NTOP_CACHE_MAX];
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#ifdef HAVE_IPV6
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static int ndx6;
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static struct { struct in6_addr ipv6; } ntop6_cache[NTOP_CACHE_MAX];
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static struct { char s[INET6_ADDRSTRLEN+1]; } ntop6_strs[NTOP_CACHE_MAX];
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#endif
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switch (saddr->plain.sa_family) {
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case AF_INET:
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for (int i = 0; i < NTOP_CACHE_MAX; ++i) {
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if (ntop4_cache[i].ipv4.s_addr == saddr->ipv4.sin_addr.s_addr) {
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buffer_copy_string(b, ntop4_strs[i].s);
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return 0;
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}
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}
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break;
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#ifdef HAVE_IPV6
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case AF_INET6:
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for (int i = 0; i < NTOP_CACHE_MAX; ++i) {
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if (0 == memcmp(ntop6_cache[i].ipv6.s6_addr,
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saddr->ipv6.sin6_addr.s6_addr, 16)) {
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buffer_copy_string(b, ntop6_strs[i].s);
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return 0;
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}
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}
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break;
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#endif
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default:
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break;
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}
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if (0 != sock_addr_inet_ntop_copy_buffer(b, saddr)) {
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buffer_string_set_length(b, 0);
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return -1;
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}
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switch (saddr->plain.sa_family) {
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case AF_INET:
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ntop4_cache[ndx4].ipv4.s_addr = saddr->ipv4.sin_addr.s_addr;
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memcpy(ntop4_strs+ndx4, b->ptr, buffer_string_length(b)+1);
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if (++ndx4 == NTOP_CACHE_MAX) ndx4 = 0;
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break;
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#ifdef HAVE_IPV6
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case AF_INET6:
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memcpy(ntop6_cache[ndx6].ipv6.s6_addr,saddr->ipv6.sin6_addr.s6_addr,16);
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memcpy(ntop6_strs+ndx6, b->ptr, buffer_string_length(b)+1);
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if (++ndx6 == NTOP_CACHE_MAX) ndx6 = 0;
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break;
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#endif
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default:
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break;
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}
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return 0;
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}
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