diff options
| -rw-r--r-- | include/resolv.h | 4 | ||||
| -rw-r--r-- | libc/inet/resolv.c | 52 |
2 files changed, 54 insertions, 2 deletions
diff --git a/include/resolv.h b/include/resolv.h index 0afb37507..655636596 100644 --- a/include/resolv.h +++ b/include/resolv.h @@ -336,8 +336,8 @@ __END_DECLS #endif #define dn_comp __dn_comp #define dn_expand __dn_expand -#if 0 #define dn_skipname __dn_skipname +#if 0 #define fp_resstat __fp_resstat #define loc_aton __loc_aton #define loc_ntoa __loc_ntoa @@ -388,7 +388,6 @@ int b64_ntop (u_char const *, size_t, char *, size_t) __THROW; int b64_pton (char const *, u_char *, size_t) __THROW; int loc_aton (const char *ascii, u_char *binary) __THROW; const char * loc_ntoa (const u_char *binary, char *ascii) __THROW; -int dn_skipname (const u_char *, const u_char *) __THROW; void putlong (u_int32_t, u_char *) __THROW; void putshort (u_int16_t, u_char *) __THROW; const char * p_class (int) __THROW; @@ -405,6 +404,7 @@ const char * p_option (u_long option) __THROW; char * p_secstodate (u_long) __THROW; int dn_count_labels (const char *) __THROW; #endif +int dn_skipname (const u_char *, const u_char *) __THROW; int dn_comp (const char *, u_char *, int, u_char **, u_char **) __THROW; int dn_expand (const u_char *, const u_char *, const u_char *, diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c index a74ab30af..6bfe52c79 100644 --- a/libc/inet/resolv.c +++ b/libc/inet/resolv.c @@ -3348,6 +3348,58 @@ int ns_name_compress(const char *src, return ns_name_pack(tmp, dst, dstsiz, dnptrs, lastdnptr); } + +int ns_name_skip(const unsigned char **ptrptr, + const unsigned char *eom) +{ + const unsigned char *cp; + u_int n; + int l; + + cp = *ptrptr; + while (cp < eom && (n = *cp++) != 0) { + /* Check for indirection. */ + switch (n & NS_CMPRSFLGS) { + case 0: /*%< normal case, n == len */ + cp += n; + continue; + case NS_TYPE_ELT: /*%< EDNS0 extended label */ + if ((l = labellen(cp - 1)) < 0) { + errno = EMSGSIZE; /*%< XXX */ + return -1; + } + cp += l; + continue; + case NS_CMPRSFLGS: /*%< indirection */ + cp++; + break; + default: /*%< illegal type */ + errno = EMSGSIZE; + return -1; + } + + break; + } + + if (cp > eom) { + errno = EMSGSIZE; + return -1; + } + + *ptrptr = cp; + + return 0; +} + +int dn_skipname(const unsigned char *ptr, const unsigned char *eom) +{ + const unsigned char *saveptr = ptr; + + if (ns_name_skip(&ptr, eom) == -1) + return -1; + + return ptr - saveptr; +} #endif /* L_ns_name */ |