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- /* Copyright (c) 2003-2004, Roger Dingledine
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
- * Copyright (c) 2007-2018, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- /**
- * \file ipv4.c
- * \brief Functions for encoding and decoding IPv4 addresses into strings
- **/
- #include "orconfig.h"
- #include "lib/cc/torint.h"
- #include "lib/net/ipv4.h"
- #include "lib/string/printf.h"
- #include "lib/string/scanf.h"
- #ifdef HAVE_ARPA_INET_H
- #include <arpa/inet.h>
- #endif
- #ifdef _WIN32
- #include <winsock2.h>
- #endif
- /** Set *addr to the IP address (in dotted-quad notation) stored in *str.
- * Return 1 on success, 0 if *str is badly formatted.
- * (Like inet_aton(str,addr), but works on Windows and Solaris.)
- */
- int
- tor_inet_aton(const char *str, struct in_addr* addr)
- {
- unsigned a,b,c,d;
- char more;
- if (tor_sscanf(str, "%3u.%3u.%3u.%3u%c", &a,&b,&c,&d,&more) != 4)
- return 0;
- if (a > 255) return 0;
- if (b > 255) return 0;
- if (c > 255) return 0;
- if (d > 255) return 0;
- addr->s_addr = htonl((a<<24) | (b<<16) | (c<<8) | d);
- return 1;
- }
- /** Given an IPv4 in_addr struct *<b>in</b> (in network order, as usual),
- * write it as a string into the <b>buf_len</b>-byte buffer in
- * <b>buf</b>. Returns a non-negative integer on success.
- * Returns -1 on failure.
- */
- int
- tor_inet_ntoa(const struct in_addr *in, char *buf, size_t buf_len)
- {
- uint32_t a = ntohl(in->s_addr);
- return tor_snprintf(buf, buf_len, "%d.%d.%d.%d",
- (int)(uint8_t)((a>>24)&0xff),
- (int)(uint8_t)((a>>16)&0xff),
- (int)(uint8_t)((a>>8 )&0xff),
- (int)(uint8_t)((a )&0xff));
- }
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