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86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
23 years ago
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#include <stdlib.h>
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#include "taia.h"
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#include "openreadclose.h"
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#include "byte.h"
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#include "ip4.h"
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#include "ip6.h"
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#include "dns.h"
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static stralloc data = {0};
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static int init(char ip[256])
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{
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int i;
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int j;
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int iplen = 0;
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char *x;
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x = getenv("DNSCACHEIP");
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if (x)
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while (iplen <= 60) {
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if (*x == '.')
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++x;
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else {
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i = scan_ip6(x,ip + iplen);
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if (!i) break;
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x += i;
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iplen += 16;
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}
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}
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if (!iplen) {
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i = openreadclose("/etc/resolv.conf",&data,64);
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if (i == -1) return -1;
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if (i) {
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if (!stralloc_append(&data,"\n")) return -1;
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i = 0;
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for (j = 0;j < data.len;++j)
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if (data.s[j] == '\n') {
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if (byte_equal("nameserver ",11,data.s + i) || byte_equal("nameserver\t",11,data.s + i)) {
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i += 10;
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while ((data.s[i] == ' ') || (data.s[i] == '\t'))
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++i;
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if (iplen <= 60)
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if (scan_ip6(data.s + i,ip + iplen)) {
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iplen += 16;
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}
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}
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i = j + 1;
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}
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}
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}
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if (!iplen) {
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byte_copy(ip,16,"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1");
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iplen = 16;
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}
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byte_zero(ip + iplen,256 - iplen);
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return 0;
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}
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static int ok = 0;
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static unsigned int uses;
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static struct taia deadline;
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static char ip[256]; /* defined if ok */
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int dns_resolvconfip(char s[256])
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{
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struct taia now;
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taia_now(&now);
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if (taia_less(&deadline,&now)) ok = 0;
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if (!uses) ok = 0;
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if (!ok) {
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if (init(ip) == -1) return -1;
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taia_uint(&deadline,600);
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taia_add(&deadline,&now,&deadline);
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uses = 10000;
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ok = 1;
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}
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--uses;
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byte_copy(s,256,ip);
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return 0;
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}
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