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70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
#include <stdlib.h>
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#include <errno.h>
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#include "byte.h"
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#include "dns.h"
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int dns_domain_fromdot(char **out,const char *buf,unsigned int n)
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{
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char label[63];
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unsigned int labellen = 0; /* <= sizeof label */
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char name[255];
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unsigned int namelen = 0; /* <= sizeof name */
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char ch;
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char *x;
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errno = EINVAL;
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for (;;) {
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if (!n) break;
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ch = *buf++; --n;
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if (ch == '.') {
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if (labellen) {
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if (namelen + labellen + 1 > sizeof name) return 0;
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name[namelen++] = labellen;
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byte_copy(name + namelen,labellen,label);
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namelen += labellen;
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labellen = 0;
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}
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continue;
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}
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if (ch == '\\') {
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if (!n) break;
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ch = *buf++; --n;
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if ((ch >= '0') && (ch <= '7')) {
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ch -= '0';
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if (n && (*buf >= '0') && (*buf <= '7')) {
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ch <<= 3;
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ch += *buf - '0';
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++buf; --n;
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if (n && (*buf >= '0') && (*buf <= '7')) {
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ch <<= 3;
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ch += *buf - '0';
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++buf; --n;
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}
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}
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}
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}
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if (labellen >= sizeof label) return 0;
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label[labellen++] = ch;
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}
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if (labellen) {
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if (namelen + labellen + 1 > sizeof name) return 0;
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name[namelen++] = labellen;
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byte_copy(name + namelen,labellen,label);
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namelen += labellen;
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labellen = 0;
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}
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if (namelen + 1 > sizeof name) return 0;
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name[namelen++] = 0;
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x = malloc(namelen);
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if (!x) return 0;
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byte_copy(x,namelen,name);
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if (*out) free(*out);
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*out = x;
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return 1;
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}
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