diff options
author | Jannis Hoffmann <jannis@fehcom.de> | 2024-07-09 13:58:20 +0200 |
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committer | Jannis Hoffmann <jannis@fehcom.de> | 2024-07-09 13:58:20 +0200 |
commit | 249866e3d1e11dc72eaa1305f4bb479ded92ef38 (patch) | |
tree | 7118c5f58e29fe61c100e4d067bb90ba8d52589e /src/dnsstub/dns_dfd.c | |
parent | 96cf8dffe4f7b0b910f790066ae622dc429eb522 (diff) |
reorganized file structure
Moved c files into src/.
Corrected VERSION file.
Removed BUILD and FILES.
Diffstat (limited to 'src/dnsstub/dns_dfd.c')
-rw-r--r-- | src/dnsstub/dns_dfd.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/dnsstub/dns_dfd.c b/src/dnsstub/dns_dfd.c new file mode 100644 index 0000000..756a1f8 --- /dev/null +++ b/src/dnsstub/dns_dfd.c @@ -0,0 +1,76 @@ +#include "error.h" +#include "alloc.h" +#include "byte.h" +#include "dnsresolv.h" + +/** + @file dns_dfd.c + @author djb + @source ucspi-tcp + @brief domain name qualification (domain from dot) +*/ + +int dns_domain_fromdot(char **out,const char *buf,unsigned int n) +{ + char label[63]; + unsigned int labellen = 0; /* <= sizeof label */ + char name[255]; + unsigned int namelen = 0; /* <= sizeof name */ + char ch; + char *x; + + errno = EPROTO; + + for (;;) { + if (!n) break; + ch = *buf++; --n; + if (ch == '.') { + if (labellen) { + if (namelen + labellen + 1 > sizeof(name)) return 0; + name[namelen++] = labellen; + byte_copy(name + namelen,labellen,label); + namelen += labellen; + labellen = 0; + } + continue; + } + if (ch == '\\') { // octal -> decimal + if (!n) break; + ch = *buf++; --n; + if ((ch >= '0') && (ch <= '7')) { + ch -= '0'; + if (n && (*buf >= '0') && (*buf <= '7')) { + ch <<= 3; + ch += *buf - '0'; + ++buf; --n; + if (n && (*buf >= '0') && (*buf <= '7')) { + ch <<= 3; + ch += *buf - '0'; + ++buf; --n; + } + } + } + } + if (labellen >= sizeof(label)) return 0; + label[labellen++] = ch; + } + + if (labellen) { + if (namelen + labellen + 1 > sizeof(name)) return 0; + name[namelen++] = labellen; + byte_copy(name + namelen,labellen,label); + namelen += labellen; + labellen = 0; + } + + if (namelen + 1 > sizeof(name)) return 0; + name[namelen++] = 0; + + x = alloc(namelen); + if (!x) return DNS_MEM; + byte_copy(x,namelen,name); + + if (*out) alloc_free(*out); + *out = x; + return 1; +} |