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128 lines (109 sloc) 2.239 kb
#include <unistd.h>
#include "open.h"
#include "error.h"
#include "str.h"
#include "byte.h"
#include "error.h"
#include "direntry.h"
#include "ip4.h"
#include "dns.h"
#include "openreadclose.h"
#include "roots.h"
static stralloc data;
static int roots_find(char *q)
{
int i;
int j;
i = 0;
while (i < data.len) {
j = dns_domain_length(data.s + i);
if (dns_domain_equal(data.s + i,q)) return i + j;
i += j;
i += 64;
}
return -1;
}
static int roots_search(char *q)
{
int r;
for (;;) {
r = roots_find(q);
if (r >= 0) return r;
if (!*q) return -1; /* user misconfiguration */
q += *q;
q += 1;
}
}
int roots(char servers[64],char *q)
{
int r;
r = roots_find(q);
if (r == -1) return 0;
byte_copy(servers,64,data.s + r);
return 1;
}
int roots_same(char *q,char *q2)
{
return roots_search(q) == roots_search(q2);
}
static int init2(DIR *dir)
{
direntry *d;
const char *fqdn;
static char *q;
static stralloc text;
char servers[64];
int serverslen;
int i;
int j;
for (;;) {
errno = 0;
d = readdir(dir);
if (!d) {
if (errno) return 0;
return 1;
}
if (d->d_name[0] != '.') {
if (openreadclose(d->d_name,&text,32) != 1) return 0;
if (!stralloc_append(&text,"\n")) return 0;
fqdn = d->d_name;
if (str_equal(fqdn,"@")) fqdn = ".";
if (!dns_domain_fromdot(&q,fqdn,str_len(fqdn))) return 0;
serverslen = 0;
j = 0;
for (i = 0;i < text.len;++i)
if (text.s[i] == '\n') {
if (serverslen <= 60)
if (ip4_scan(text.s + j,servers + serverslen))
serverslen += 4;
j = i + 1;
}
byte_zero(servers + serverslen,64 - serverslen);
if (!stralloc_catb(&data,q,dns_domain_length(q))) return 0;
if (!stralloc_catb(&data,servers,64)) return 0;
}
}
}
static int init1(void)
{
DIR *dir;
int r;
if (chdir("servers") == -1) return 0;
dir = opendir(".");
if (!dir) return 0;
r = init2(dir);
closedir(dir);
return r;
}
int roots_init(void)
{
int fddir;
int r;
if (!stralloc_copys(&data,"")) return 0;
fddir = open_read(".");
if (fddir == -1) return 0;
r = init1();
if (fchdir(fddir) == -1) r = 0;
close(fddir);
return r;
}
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