/**************************************************************************** * libc/net/lib_inetpton.c * * Copyright (C) 2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Includes some logic extracted from hwport_ftpd, written by Jaehyuk Cho * which was released under the BSD license. * * Copyright (C) HWPORT.COM. All rights reserved. * Author: JAEHYUK CHO * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* If netdb support is enabled, then we need to be able to manage IPv4 and * IPv6 addresses, regardless of networking support. */ #ifdef CONFIG_NETDB_HOSTFILE # undef CONFIG_NET_IPv4 # undef CONFIG_NET_IPv6 # define CONFIG_NET_IPv4 1 # define CONFIG_NET_IPv6 1 #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: inet_ipv4_pton * * Description: * The inet_ipv4_pton() function converts an IPv4 address in its standard * text presentation form into its numeric binary form. * * Input Parameters: * src - The src argument points to the string being passed in. * dest - The dest argument points to a numstr into which the function stores * the numeric address; this must be large enough to hold the numeric * address (32 bits for AF_INET, 128 bits for AF_INET6). * * Returned Value: * inet_ipv4_pton() will returns 1 if the conversion succeeds. It will * return 0 if the input is not a valid IPv4 dotted-decimal string string. * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 static int inet_ipv4_pton(FAR const char *src, FAR void *dest) { size_t srcoffset; size_t numoffset; int value; int ndots; uint8_t ch; char numstr[4]; uint8_t *ip; (void)memset(dest, 0, sizeof(struct in_addr)); ip = (uint8_t *)dest; srcoffset = 0; numoffset = 0; ndots = 0; for (; ; ) { ch = (uint8_t)src[srcoffset++]; if (ch == '.' || ch == '\0') { if (ch == '.' && ndots >= 4) { /* Too many dots */ break; } if (numoffset < 1) { /* Empty numeric string */ break; } numstr[numoffset] = '\0'; numoffset = 0; value = atoi(numstr); if (value < 0 || value > 255) { /* Out of range value */ break; } ip[ndots] = (uint8_t)value; if (ch == '\0') { if (ndots != 3) { /* Not enough dots */ break; } /* Return 1 if the conversion succeeds */ return 1; } ndots++; } else if (ch >= '0' && ch <= '9') { numstr[numoffset++] = ch; if (numoffset >= 4) { /* Number is too long */ break; } } else { /* Illegal character */ break; } } /* Return zero if there is any problem parsing the input */ return 0; } #endif /**************************************************************************** * Name: inet_ipv6_pton * * Description: * The inet_ipv6_pton() function converts an IPv6 address in its standard * text presentation form into its numeric binary form. * * Input Parameters: * src - The src argument points to the string being passed in. * dest - The dest argument points to a numstr into which the function stores * the numeric address; this must be large enough to hold the numeric * address (32 bits for AF_INET, 128 bits for AF_INET6). * * Returned Value: * inet_ipv6_pton() will returns 1 if the conversion succeeds. It will * return 0 if the input is not a valid IPv6 address string. * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 static int inet_ipv6_pton(FAR const char *src, FAR void *dest) { size_t srcoffset; size_t numoffset; long value; int nsep; int nrsep; uint8_t ch; char numstr[5]; uint8_t ip[sizeof(struct in6_addr)]; uint8_t rip[sizeof(struct in6_addr)]; bool rtime; (void)memset(dest, 0, sizeof(struct in6_addr)); srcoffset = 0; numoffset = 0; nsep = 0; nrsep = 0; rtime = false; for (; ; ) { ch = (uint8_t)src[srcoffset++]; if (ch == ':' || ch == '\0') { if (ch == ':' && (nsep + nrsep) >= 8) { /* Too many separators */ break; } if (ch != '\0' && numoffset < 1) { /* Empty numeric string */ if (rtime && nrsep > 1) { /* dup simple */ break; } numoffset = 0; rtime = true; continue; } numstr[numoffset] = '\0'; numoffset = 0; value = strtol(numstr, NULL, 16); if (value < 0 || value > 0xffff) { /* Out of range value */ break; } if (!rtime) { ip[(nsep << 1) + 0] = (uint8_t)((value >> 8) & 0xff); ip[(nsep << 1) + 1] = (uint8_t)((value >> 0) & 0xff); nsep++; } else { rip[(nrsep << 1) + 0] = (uint8_t)((value >> 8) & 0xff); rip[(nrsep << 1) + 1] = (uint8_t)((value >> 0) & 0xff); nrsep++; } if (ch == '\0' /* || ch == '/' */) { if ((nsep <= 1 && nrsep <= 0) || (nsep + nrsep) < 1 || (nsep + nrsep) > 8) { /* Separator count problem */ break; } if (nsep > 0) { memcpy(dest, &ip[0], nsep << 1); } if (nrsep > 0) { memcpy(dest + (16 - (nrsep << 1)), &rip[0], nrsep << 1); } /* Return 1 if the conversion succeeds */ return 1; } } else if ((ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F')) { numstr[numoffset++] = ch; if (numoffset >= 5) { /* Numeric string is too long */ break; } } else { /* Illegal character */ break; } } /* Return zero if there is any problem parsing the input */ return 0; } #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: inet_pton * * Description: * The inet_pton() function converts an address in its standard text * presentation form into its numeric binary form. * * If the af argument of inet_pton() is AF_INET, the src string will be * in the standard IPv4 dotted-decimal form: * * ddd.ddd.ddd.ddd * * where "ddd" is a one to three digit decimal number between 0 and 255. * * If the af argument of inet_pton() is AF_INET6, the src string will be in * one of the following standard IPv6 text forms: * * 1. The preferred form is "x:x:x:x:x:x:x:x", where the 'x' s are the * hexadecimal values of the eight 16-bit pieces of the address. Leading * zeros in individual fields can be omitted, but there must be at least * one numeral in every field. * * 2. A string of contiguous zero fields in the preferred form can be shown * as "::". The "::" can only appear once in an address. Unspecified * addresses ( "0:0:0:0:0:0:0:0" ) may be represented simply as "::". * * 3. A third form that is sometimes more convenient when dealing with a * mixed environment of IPv4 and IPv6 nodes is "x:x:x:x:x:x:d.d.d.d", * where the 'x' s are the hexadecimal values of the six high-order * 16-bit pieces of the address, and the 'd' s are the decimal values * of the four low-order 8-bit pieces of the address (standard IPv4 * representation). * * Input Parameters: * af - The af argument specifies the family of the address. This can be * AF_INET or AF_INET6. * src - The src argument points to the string being passed in. * dest - The dest argument points to memory into which the function stores * the numeric address; this must be large enough to hold the numeric * address (32 bits for AF_INET, 128 bits for AF_INET6). * * Returned Value: * The inet_pton() function returns 1 if the conversion succeeds, with the * address pointed to by dest in network byte order. It will return 0 if the * input is not a valid IPv4 dotted-decimal string or a valid IPv6 address * string, or -1 with errno set to EAFNOSUPPORT if the af argument is * unknown. * ****************************************************************************/ int inet_pton(int af, FAR const char *src, FAR void *dest) { DEBUGASSERT(src && dest); /* Do the conversion according to the IP version */ switch (af) { #ifdef CONFIG_NET_IPv4 case AF_INET: return inet_ipv4_pton(src, dest); #endif #ifdef CONFIG_NET_IPv6 case AF_INET6: return inet_ipv6_pton(src, dest); #endif default: set_errno(EAFNOSUPPORT); return ERROR; } }