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68 lines
1.4 KiB
68 lines
1.4 KiB
#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,size_t 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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} |
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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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