/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk> * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ /* * Manuel Novoa III Dec 2000 * * Converted to use my new (un)signed long (long) to string routines, which * are smaller than the previous functions and don't require static buffers. * In the process, removed the reference to strcat and cut object size of * inet_ntoa in half (from 190 bytes down to 94). * * Manuel Novoa III Feb 2002 * * Changed to use _int10tostr. */ #include <stdio.h> #include <string.h> #include <ctype.h> #include <netinet/in.h> #include <arpa/inet.h> #include <bits/uClibc_uintmaxtostr.h> #ifdef L_inet_aton /* * More undocumented inet_aton features. * (read: uclibc doesnt support but glibc does) * http://www.mkssoftware.com/docs/man3/inet_aton.3.asp * * *cp can take the form of: * a.b.c.d - {a,b,c,d} -> 1 byte * a.b.c - {a,b} -> 1 byte {c} -> 2 bytes * a.b - {a} -> 1 byte {b} -> 3 bytes * a - {a} -> 4 bytes * * Each part may be decimal, octal, or hexadecimal as in ISO C. * 0x or 0X -> hexadecimal * leading 0 -> octal * all else -> decimal */ int inet_aton(const char *cp, struct in_addr *addrptr) { in_addr_t addr; int value; int part; if (cp == NULL) { return 0; } addr = 0; for (part = 1; part <= 4; part++) { if (!isdigit(*cp)) return 0; value = 0; while (isdigit(*cp)) { value *= 10; value += *cp++ - '0'; if (value > 255) return 0; } if (part < 4) { if (*cp++ != '.') return 0; } else { char c = *cp++; if (c != '\0' && !isspace(c)) return 0; } addr <<= 8; addr |= value; } /* W. Richard Stevens in his book UNIX Network Programming, * Volume 1, second edition, on page 71 says: * * An undocumented feature of inet_aton is that if addrptr is * a null pointer, the function still performs it validation * of the input string, but does not store the result. */ if (addrptr) { addrptr->s_addr = htonl(addr); } return 1; } libc_hidden_def(inet_aton) #endif #ifdef L_inet_addr in_addr_t inet_addr(const char *cp) { struct in_addr a; if (!inet_aton(cp, &a)) return INADDR_NONE; else return a.s_addr; } libc_hidden_def(inet_addr) #endif #ifdef L_inet_ntoa #define INET_NTOA_MAX_LEN 16 /* max 12 digits + 3 '.'s + 1 nul */ static char *__inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN]) { in_addr_t addr = ntohl(in.s_addr); int i; char *p, *q; q = 0; p = buf + INET_NTOA_MAX_LEN - 1; /* cannot use sizeof(buf) here */ for (i = 0; i < 4; i++ ) { p = _int10tostr(p, addr & 0xff) - 1; addr >>= 8; if (q) { *q = '.'; } q = p; } return p+1; } strong_alias(__inet_ntoa_r,inet_ntoa_r) char *inet_ntoa(struct in_addr in) { static char buf[INET_NTOA_MAX_LEN]; return __inet_ntoa_r(in, buf); } libc_hidden_def(inet_ntoa) #endif #ifdef L_inet_makeaddr /* for some reason it does not remove the jump relocation */ /* * Formulate an Internet address from network + host. Used in * building addresses stored in the ifnet structure. */ struct in_addr inet_makeaddr(in_addr_t net, in_addr_t host) { struct in_addr in; if (net < 128) in.s_addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST); else if (net < 65536) in.s_addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST); else if (net < 16777216UL) in.s_addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST); else in.s_addr = net | host; in.s_addr = htonl(in.s_addr); return in; } libc_hidden_def(inet_makeaddr) #endif #ifdef L_inet_lnaof /* * Return the local network address portion of an * internet address; handles class a/b/c network * number formats. */ in_addr_t inet_lnaof(struct in_addr in) { in_addr_t i = ntohl(in.s_addr); if (IN_CLASSA(i)) return (i & IN_CLASSA_HOST); else if (IN_CLASSB(i)) return (i & IN_CLASSB_HOST); else return (i & IN_CLASSC_HOST); } #endif #ifdef L_inet_netof /* * Return the network number from an internet * address; handles class a/b/c network #'s. */ in_addr_t inet_netof(struct in_addr in) { in_addr_t i = ntohl(in.s_addr); if (IN_CLASSA(i)) return ((i & IN_CLASSA_NET) >> IN_CLASSA_NSHIFT); else if (IN_CLASSB(i)) return ((i & IN_CLASSB_NET) >> IN_CLASSB_NSHIFT); else return ((i & IN_CLASSC_NET) >> IN_CLASSC_NSHIFT); } libc_hidden_def(inet_netof) #endif