/* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. Copyright (c) 2014 MariaDB Foundation This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include "item_inetfunc.h" #include "my_net.h" /////////////////////////////////////////////////////////////////////////// static const int IN_ADDR_SIZE= sizeof (in_addr); static const int IN6_ADDR_SIZE= sizeof (in6_addr); static const int IN6_ADDR_NUM_WORDS= IN6_ADDR_SIZE / 2; static const char HEX_DIGITS[]= "0123456789abcdef"; /////////////////////////////////////////////////////////////////////////// longlong Item_func_inet_aton::val_int() { DBUG_ASSERT(fixed); uint byte_result= 0; ulonglong result= 0; // We are ready for 64 bit addresses const char *p,* end; char c= '.'; // we mark c to indicate invalid IP in case length is 0 int dot_count= 0; StringBuffer<36> tmp; String *s= args[0]->val_str_ascii(&tmp); if (!s) // If null value goto err; null_value= 0; end= (p = s->ptr()) + s->length(); while (p < end) { c= *p++; int digit= (int) (c - '0'); if (digit >= 0 && digit <= 9) { if ((byte_result= byte_result * 10 + digit) > 255) goto err; // Wrong address } else if (c == '.') { dot_count++; result= (result << 8) + (ulonglong) byte_result; byte_result= 0; } else goto err; // Invalid character } if (c != '.') // IP number can't end on '.' { /* Attempt to support short forms of IP-addresses. It's however pretty basic one comparing to the BSD support. Examples: 127 -> 0.0.0.127 127.255 -> 127.0.0.255 127.256 -> NULL (should have been 127.0.1.0) 127.2.1 -> 127.2.0.1 */ switch (dot_count) { case 1: result<<= 8; /* Fall through */ case 2: result<<= 8; /* Fall through */ } return (result << 8) + (ulonglong) byte_result; } err: null_value=1; return 0; } /////////////////////////////////////////////////////////////////////////// String* Item_func_inet_ntoa::val_str(String* str) { DBUG_ASSERT(fixed); ulonglong n= (ulonglong) args[0]->val_int(); /* We do not know if args[0] is NULL until we have called some val function on it if args[0] is not a constant! Also return null if n > 255.255.255.255 */ if ((null_value= (args[0]->null_value || n > 0xffffffff))) return 0; // Null value str->set_charset(collation.collation); str->length(0); uchar buf[8]; int4store(buf, n); /* Now we can assume little endian. */ char num[4]; num[3]= '.'; for (uchar *p= buf + 4; p-- > buf;) { uint c= *p; uint n1, n2; // Try to avoid divisions n1= c / 100; // 100 digits c-= n1 * 100; n2= c / 10; // 10 digits c-= n2 * 10; // last digit num[0]= (char) n1 + '0'; num[1]= (char) n2 + '0'; num[2]= (char) c + '0'; uint length= (n1 ? 4 : n2 ? 3 : 2); // Remove pre-zero uint dot_length= (p <= buf) ? 1 : 0; (void) str->append(num + 4 - length, length - dot_length, &my_charset_latin1); } return str; } /////////////////////////////////////////////////////////////////////////// /** Check the function argument, handle errors properly. @return The function value. */ longlong Item_func_inet_bool_base::val_int() { DBUG_ASSERT(fixed); if (args[0]->result_type() != STRING_RESULT) // String argument expected return 0; String buffer; String *arg_str= args[0]->val_str(&buffer); if (!arg_str) // Out-of memory happened. The error has been reported. return 0; // Or: the underlying field is NULL return calc_value(arg_str) ? 1 : 0; } /////////////////////////////////////////////////////////////////////////// /** Check the function argument, handle errors properly. @param [out] buffer Buffer for string operations. @return The function value. */ String *Item_func_inet_str_base::val_str_ascii(String *buffer) { DBUG_ASSERT(fixed); if (args[0]->result_type() != STRING_RESULT) // String argument expected { null_value= true; return NULL; } StringBuffer tmp; String *arg_str= args[0]->val_str(&tmp); if (!arg_str) // Out-of memory happened. The error has been reported. { // Or: the underlying field is NULL null_value= true; return NULL; } null_value= !calc_value(arg_str, buffer); return null_value ? NULL : buffer; } /////////////////////////////////////////////////////////////////////////// /** Tries to convert given string to binary IPv4-address representation. This is a portable alternative to inet_pton(AF_INET). @param str String to convert. @param str_len String length. @param[out] ipv4_address Buffer to store IPv4-address. @return Completion status. @retval false Given string does not represent an IPv4-address. @retval true The string has been converted sucessfully. @note The problem with inet_pton() is that it treats leading zeros in IPv4-part differently on different platforms. */ static bool str_to_ipv4(const char *str, int str_length, in_addr *ipv4_address) { if (str_length < 7) { DBUG_PRINT("error", ("str_to_ipv4(%.*s): " "invalid IPv4 address: too short.", str_length, str)); return false; } if (str_length > 15) { DBUG_PRINT("error", ("str_to_ipv4(%.*s): " "invalid IPv4 address: too long.", str_length, str)); return false; } unsigned char *ipv4_bytes= (unsigned char *) ipv4_address; const char *p= str; int byte_value= 0; int chars_in_group= 0; int dot_count= 0; char c= 0; while (((p - str) < str_length) && *p) { c= *p++; if (my_isdigit(&my_charset_latin1, c)) { ++chars_in_group; if (chars_in_group > 3) { DBUG_PRINT("error", ("str_to_ipv4(%.*s): invalid IPv4 address: " "too many characters in a group.", str_length, str)); return false; } byte_value= byte_value * 10 + (c - '0'); if (byte_value > 255) { DBUG_PRINT("error", ("str_to_ipv4(%.*s): invalid IPv4 address: " "invalid byte value.", str_length, str)); return false; } } else if (c == '.') { if (chars_in_group == 0) { DBUG_PRINT("error", ("str_to_ipv4(%.*s): invalid IPv4 address: " "too few characters in a group.", str_length, str)); return false; } ipv4_bytes[dot_count]= (unsigned char) byte_value; ++dot_count; byte_value= 0; chars_in_group= 0; if (dot_count > 3) { DBUG_PRINT("error", ("str_to_ipv4(%.*s): invalid IPv4 address: " "too many dots.", str_length, str)); return false; } } else { DBUG_PRINT("error", ("str_to_ipv4(%.*s): invalid IPv4 address: " "invalid character at pos %d.", str_length, str, (int) (p - str))); return false; } } if (c == '.') { DBUG_PRINT("error", ("str_to_ipv4(%.*s): invalid IPv4 address: " "ending at '.'.", str_length, str)); return false; } if (dot_count != 3) { DBUG_PRINT("error", ("str_to_ipv4(%.*s): invalid IPv4 address: " "too few groups.", str_length, str)); return false; } ipv4_bytes[3]= (unsigned char) byte_value; DBUG_PRINT("info", ("str_to_ipv4(%.*s): valid IPv4 address: %d.%d.%d.%d", str_length, str, ipv4_bytes[0], ipv4_bytes[1], ipv4_bytes[2], ipv4_bytes[3])); return true; } /////////////////////////////////////////////////////////////////////////// /** Tries to convert given string to binary IPv6-address representation. This is a portable alternative to inet_pton(AF_INET6). @param str String to convert. @param str_len String length. @param[out] ipv6_address Buffer to store IPv6-address. @return Completion status. @retval false Given string does not represent an IPv6-address. @retval true The string has been converted sucessfully. @note The problem with inet_pton() is that it treats leading zeros in IPv4-part differently on different platforms. */ static bool str_to_ipv6(const char *str, int str_length, in6_addr *ipv6_address) { if (str_length < 2) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: too short.", str_length, str)); return false; } if (str_length > 8 * 4 + 7) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: too long.", str_length, str)); return false; } memset(ipv6_address, 0, IN6_ADDR_SIZE); const char *p= str; if (*p == ':') { ++p; if (*p != ':') { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "can not start with ':x'.", str_length, str)); return false; } } char *ipv6_bytes= (char *) ipv6_address; char *ipv6_bytes_end= ipv6_bytes + IN6_ADDR_SIZE; char *dst= ipv6_bytes; char *gap_ptr= NULL; const char *group_start_ptr= p; int chars_in_group= 0; int group_value= 0; while (((p - str) < str_length) && *p) { char c= *p++; if (c == ':') { group_start_ptr= p; if (!chars_in_group) { if (gap_ptr) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "too many gaps(::).", str_length, str)); return false; } gap_ptr= dst; continue; } if (!*p || ((p - str) >= str_length)) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "ending at ':'.", str_length, str)); return false; } if (dst + 2 > ipv6_bytes_end) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "too many groups (1).", str_length, str)); return false; } dst[0]= (unsigned char) (group_value >> 8) & 0xff; dst[1]= (unsigned char) group_value & 0xff; dst += 2; chars_in_group= 0; group_value= 0; } else if (c == '.') { if (dst + IN_ADDR_SIZE > ipv6_bytes_end) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "unexpected IPv4-part.", str_length, str)); return false; } if (!str_to_ipv4(group_start_ptr, str + str_length - group_start_ptr, (in_addr *) dst)) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "invalid IPv4-part.", str_length, str)); return false; } dst += IN_ADDR_SIZE; chars_in_group= 0; break; } else { const char *hdp= strchr(HEX_DIGITS, my_tolower(&my_charset_latin1, c)); if (!hdp) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "invalid character at pos %d.", str_length, str, (int) (p - str))); return false; } if (chars_in_group >= 4) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "too many digits in group.", str_length, str)); return false; } group_value <<= 4; group_value |= hdp - HEX_DIGITS; DBUG_ASSERT(group_value <= 0xffff); ++chars_in_group; } } if (chars_in_group > 0) { if (dst + 2 > ipv6_bytes_end) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "too many groups (2).", str_length, str)); return false; } dst[0]= (unsigned char) (group_value >> 8) & 0xff; dst[1]= (unsigned char) group_value & 0xff; dst += 2; } if (gap_ptr) { if (dst == ipv6_bytes_end) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "no room for a gap (::).", str_length, str)); return false; } int bytes_to_move= dst - gap_ptr; for (int i= 1; i <= bytes_to_move; ++i) { ipv6_bytes_end[-i]= gap_ptr[bytes_to_move - i]; gap_ptr[bytes_to_move - i]= 0; } dst= ipv6_bytes_end; } if (dst < ipv6_bytes_end) { DBUG_PRINT("error", ("str_to_ipv6(%.*s): invalid IPv6 address: " "too few groups.", str_length, str)); return false; } return true; } /////////////////////////////////////////////////////////////////////////// /** Converts IPv4-binary-address to a string. This function is a portable alternative to inet_ntop(AF_INET). @param[in] ipv4 IPv4-address data (byte array) @param[out] str A buffer to store string representation of IPv4-address. It must be at least of INET_ADDRSTRLEN. @note The problem with inet_ntop() is that it is available starting from Windows Vista, but the minimum supported version is Windows 2000. */ static void ipv4_to_str(const in_addr *ipv4, char *str) { const unsigned char *ipv4_bytes= (const unsigned char *) ipv4; sprintf(str, "%d.%d.%d.%d", ipv4_bytes[0], ipv4_bytes[1], ipv4_bytes[2], ipv4_bytes[3]); } /////////////////////////////////////////////////////////////////////////// /** Converts IPv6-binary-address to a string. This function is a portable alternative to inet_ntop(AF_INET6). @param[in] ipv6 IPv6-address data (byte array) @param[out] str A buffer to store string representation of IPv6-address. It must be at least of INET6_ADDRSTRLEN. @note The problem with inet_ntop() is that it is available starting from Windows Vista, but out the minimum supported version is Windows 2000. */ static void ipv6_to_str(const in6_addr *ipv6, char *str) { struct Region { int pos; int length; }; const unsigned char *ipv6_bytes= (const unsigned char *) ipv6; // 1. Translate IPv6-address bytes to words. // We can't just cast to short, because it's not guaranteed // that sizeof (short) == 2. So, we have to make a copy. uint16 ipv6_words[IN6_ADDR_NUM_WORDS]; for (int i= 0; i < IN6_ADDR_NUM_WORDS; ++i) ipv6_words[i]= (ipv6_bytes[2 * i] << 8) + ipv6_bytes[2 * i + 1]; // 2. Find "the gap" -- longest sequence of zeros in IPv6-address. Region gap= { -1, -1 }; { Region rg= { -1, -1 }; for (int i = 0; i < IN6_ADDR_NUM_WORDS; ++i) { if (ipv6_words[i] != 0) { if (rg.pos >= 0) { if (rg.length > gap.length) gap= rg; rg.pos= -1; rg.length= -1; } } else { if (rg.pos >= 0) { ++rg.length; } else { rg.pos= i; rg.length= 1; } } } if (rg.pos >= 0) { if (rg.length > gap.length) gap= rg; } } // 3. Convert binary data to string. char *p= str; for (int i = 0; i < IN6_ADDR_NUM_WORDS; ++i) { if (i == gap.pos) { // We're at the gap position. We should put trailing ':' and jump to // the end of the gap. if (i == 0) { // The gap starts from the beginning of the data -- leading ':' // should be put additionally. *p= ':'; ++p; } *p= ':'; ++p; i += gap.length - 1; } else if (i == 6 && gap.pos == 0 && (gap.length == 6 || // IPv4-compatible (gap.length == 5 && ipv6_words[5] == 0xffff) // IPv4-mapped )) { // The data represents either IPv4-compatible or IPv4-mapped address. // The IPv6-part (zeros or zeros + ffff) has been already put into // the string (str). Now it's time to dump IPv4-part. ipv4_to_str((const in_addr *) (ipv6_bytes + 12), p); return; } else { // Usual IPv6-address-field. Print it out using lower-case // hex-letters without leading zeros (recommended IPv6-format). // // If it is not the last field, append closing ':'. p += sprintf(p, "%x", ipv6_words[i]); if (i != IN6_ADDR_NUM_WORDS - 1) { *p= ':'; ++p; } } } *p= 0; } /////////////////////////////////////////////////////////////////////////// /** Converts IP-address-string to IP-address-data. @param arg IP-address-string. @param [out] buffer Buffer to store IP-address-data. @return Completion status. @retval false Given string does not represent an IP-address. @retval true The string has been converted sucessfully. */ bool Item_func_inet6_aton::calc_value(const String *arg, String *buffer) { // ipv4-string -> varbinary(4) // ipv6-string -> varbinary(16) in_addr ipv4_address; in6_addr ipv6_address; if (str_to_ipv4(arg->ptr(), arg->length(), &ipv4_address)) { buffer->length(0); buffer->append((char *) &ipv4_address, sizeof (in_addr), &my_charset_bin); return true; } if (str_to_ipv6(arg->ptr(), arg->length(), &ipv6_address)) { buffer->length(0); buffer->append((char *) &ipv6_address, sizeof (in6_addr), &my_charset_bin); return true; } return false; } /////////////////////////////////////////////////////////////////////////// /** Converts IP-address-data to IP-address-string. @param arg IP-address-data. @param [out] buffer Buffer to store IP-address-string. @return Completion status. @retval false The argument does not correspond to IP-address. @retval true The string has been converted sucessfully. */ bool Item_func_inet6_ntoa::calc_value(const String *arg, String *buffer) { if (arg->charset() != &my_charset_bin) return false; if ((int) arg->length() == IN_ADDR_SIZE) { char str[INET_ADDRSTRLEN]; ipv4_to_str((const in_addr *) arg->ptr(), str); buffer->length(0); buffer->append(str, (uint32) strlen(str), &my_charset_latin1); return true; } else if ((int) arg->length() == IN6_ADDR_SIZE) { char str[INET6_ADDRSTRLEN]; ipv6_to_str((const in6_addr *) arg->ptr(), str); buffer->length(0); buffer->append(str, (uint32) strlen(str), &my_charset_latin1); return true; } DBUG_PRINT("info", ("INET6_NTOA(): varbinary(4) or varbinary(16) expected.")); return false; } /////////////////////////////////////////////////////////////////////////// /** Checks if the passed string represents an IPv4-address. @param arg The string to check. @return Check status. @retval false The passed string does not represent an IPv4-address. @retval true The passed string represents an IPv4-address. */ bool Item_func_is_ipv4::calc_value(const String *arg) { in_addr ipv4_address; return str_to_ipv4(arg->ptr(), arg->length(), &ipv4_address); } /////////////////////////////////////////////////////////////////////////// /** Checks if the passed string represents an IPv6-address. @param arg The string to check. @return Check status. @retval false The passed string does not represent an IPv6-address. @retval true The passed string represents an IPv6-address. */ bool Item_func_is_ipv6::calc_value(const String *arg) { in6_addr ipv6_address; return str_to_ipv6(arg->ptr(), arg->length(), &ipv6_address); } /////////////////////////////////////////////////////////////////////////// /** Checks if the passed IPv6-address is an IPv4-compat IPv6-address. @param arg The IPv6-address to check. @return Check status. @retval false The passed IPv6-address is not an IPv4-compatible IPv6-address. @retval true The passed IPv6-address is an IPv4-compatible IPv6-address. */ bool Item_func_is_ipv4_compat::calc_value(const String *arg) { if ((int) arg->length() != IN6_ADDR_SIZE || arg->charset() != &my_charset_bin) return false; return IN6_IS_ADDR_V4COMPAT((struct in6_addr *) arg->ptr()); } /////////////////////////////////////////////////////////////////////////// /** Checks if the passed IPv6-address is an IPv4-mapped IPv6-address. @param arg The IPv6-address to check. @return Check status. @retval false The passed IPv6-address is not an IPv4-mapped IPv6-address. @retval true The passed IPv6-address is an IPv4-mapped IPv6-address. */ bool Item_func_is_ipv4_mapped::calc_value(const String *arg) { if ((int) arg->length() != IN6_ADDR_SIZE || arg->charset() != &my_charset_bin) return false; return IN6_IS_ADDR_V4MAPPED((struct in6_addr *) arg->ptr()); }